9．Why can some people sleep through noises like a honking car or flushing toilet，while others are awakened by the lightest sound？
To find the answer，sleep researchers at Massachusetts General Hospital conducted an unusual study of 12self-described deep sleepers．After tests confirmed that the healthy volunteers were solid sleepers，they took part in a three-night study in the university's sleep laboratory．The participants spent the night in a big and comfortable room．But the room also included four speakers positioned near the top of the bed．
During the night，the deep sleepers were subjected to 14different recorded sounds，like street traffic，toilets flushing，an ice machine dispensing and an airplane flying overhead．Next door，the researchers monitored their sleep patterns and brain waves．
As expected，all of the participants slept relatively well，but there were differences in how they responded to the noisy interruptions．Some of the sleepers didn't wake up even when a sound was blasted at 70decibels （分贝）； others were awakened by sounds at 40or 50decibels．
The researchers discovered that the difference in a sleeper's reaction to noise could be predicted by the level of brain activity called"sleep spindles''．A sleep spindle is a burst of high-frequency brain activity coming from deep inside the brain during sleep．The source of the spindles is the thalamus，a part of the brain that sends sensory information to the rest of the cortex （皮层）．
Before the study，the Massachusetts researchers theorized （推理） that the spindles are the brain's way of preventing sensory information from passing through the thalamus and waking the rest of the brain during sleep．They found that the sleepers who experienced the most sleep spindles during the night were also the soundest sleepers and were least likely to be awakened by noise．
Scientists already know that most people become lighter sleepers with age，most likely because older people experience less"slow wave sleep''，which is the deepest stage of sleep．People also produce fewer sleep spindles as they age．But even when controlling for the stage of sleep a person was in，the number of sleep spindles still predicted their risk for awakening because of noise．
More research is needed，but the findings suggest that a better understanding of sleep spindles could lead to new behavioral or drug therapies for people with sleep disorders．For instance，future studies may try to determine whether diet，exercise or other behaviors may influence the number of sleep spindles a person produces during the night．

63．Some participants can sleep well through loud noises mainly becauseB．
A．their brains don't respond to outside noises
B．their brains react differently to noises
C．they adapt to the environment quickly
D．they don't pay attention to the monitors
64．Scientists believe that the key to affecting deep sleep isA．
A．sleep spindles  B．stages of sleep    C．sleep disorders D．sensory information
65．It can be learned from the passage thatB．
A．the older a deep sleeper becomes，the lighter his sleep must be
B．the more"slow wave sleep"one experiences，the deeper sleep one has
C．the more frequently a sleeper's brain works，the less information it sends
D．the deeper sleep people have，the more likely they will be awakened by noise
66．From the passage we can predictA．
A．more factors in influencing sleep spindles may be discovered
B．more solid sleepers will take part in relative experiments
C．sleep spindles will be applied to changing one's behaviors
D．deep sleepers will probably enjoy a more healthy life．

8．A．Sunworld Dynasty Hotel
   The signature crab feast thoughtfully prepared by our NO.1 Chef Chen Ruirong combines the essence of the centennial Zhejiang and Jiangsu cuisine culture with modern concepts of healthy eating．Guests can enjoy delicious crab prepared in classic style．For our more discerning guests Chef Chen is happy to use his exquisite techniques to create the dishes that answer your desires．
   For reservations or further information，please contact （8610）5816 8888 ext 8288
B．Grand Hotel Beijing
   The new year draws near and the Grand Hotel Beijing has been preparing its annual series of gift boxes．These traditional foods，including hand-made sausages，salted Beijing duck and varieties of Chinese bread，will give you and your loved ones a taste of pure old Beijing during the holiday festivities．With just a call，you can enjoy"five-star"delicacies at home!
   For ordering please contact：（86-10）651300540 ext.312 or 313
C．Grand Metropark Yuantong Hotel Beijing
   This impressive Western-style architecture has an old world interior with traditional Chinese elements．Ideally situated on Financial Street，it is convenient to the subway and other public transportation，with the Mei Lanfang Theater nearby and several business districts within walking distance．An enterprise of the Beijing Dadi Yuantong Group，this five-star hotel is managed by the CTS HK Metropark Hotels Management Co．Ltd．
   For reservations please contact：（86-10）66026688
D．Beijing Minzu Hotel
   Beijing Minzu Hotel is an ideal place for you to spend your Christmas Eve this year．The hotel will present a special holiday dinner steeped in"European Flavor"on December 24．Excellent French wine，classical music，festive decorations and elegant cuisine will leave you feeling jolly and warm on that wonderful night．And if you are lucky Santa might have some surprising gifts for you．
   For reservations please contact：（86-10）66014466 ext.162or 163
E．Beijing Far East International Youth Hotel
  Beijing Far East International Youth Hotel，affiliated with the Beijing Tourism Group，is the first hotel in China to join the International Youth Hostels Federation．The hotel has 158 guestrooms that face into a typical Beijing courtyard．It ranks in the Top 10 of a list determined and compiled by Hostel．com on the basis of customer satisfaction，and was selected best Youth Hotel in 2006 by Hostelbookers．com．in addition，the hotel offers a very convenient location，only a few minutes walk to cultural and commercial districts such as Liu Li Chang，Tian'anmen Square，Qianmen，Dashilan and the Forbidden City．
  Website：www．fareastyh．c
  Tel：（86-10）5195 8565 ext 8561
F．Hilton Beijing Wangfujing Hotel
  Currently the Hilton Beijing Wangfujing Hotel is sweetening the pot by granting a 50 percent discount on ice-cream，desserts and cakes sold on the premises．
  Guests have a wide range of choices：on the first floor，delicious desserts and cakes can be enjoyed in repose and peace in the Library； special Macanese ice-cream can be savored in Vascoon restaurant on the fifth floor； and all can be topped off with a fine Martini in the Flames bar．The 50 percent discount also applies to those planning to enjoy that take-away cake in the comfort of home．
  Tel：（86-10）5812 8888 ext 8411．
请阅读以下个人信息，然后匹配符合他\她要求的酒店信息．
46．Charlie，a college student from America，majors in medicine．He is fond of Chinese culture，especially the Chinese ancient buildings．So he'll come to Beijing alone．Without any friends or relatives in Beijing，he has to find a good hotel according to the information given in magazines．E
47．Daisy is a sweet food lover，She is a foreign student studying in Beijing university．She likes the university very much except for its food．So she always eats outside or takes food back from outside．She enjoys reading"CHINA TODAY"to get latest information and discount information about food．F
48．David is a businessman from England．When free he enjoys going to theaters．Recently he is very interested in learning the financial information about developing countries．He has been to many countries．This month he'll come to China to investigate the market situation．C
49．Laura has to stay in Beijing owing to her project in China for a whole year，but she felt it a nice thing to have an opportunity to spend the new year festival here．She'd like to take some Chinese traditional foods to meet the need of her family．
B
50．Johnson is an epicure．Crab is his favorite．He will catch every chance to taste special，different and traditional foods all over the world．Chinese cuisine culture has made deep impression on him．So he thinks his visit to China this Summer will be a good expectation．A．

7．Honeybees are disappearing for unknown reasons around the United States．Last winter，bees disappeared from 23percent of American beekeeping businesses．Causes of the phenomenon，however，have remained a mystery．
Now，scientists from several universities and the United States Department of Agriculture say they have a possible explanation for the bee decline．It is a little-known virus called Israeli acute--paralysis virus （IAPV）．The virus kills bees．Researchers in Israel first described it in 2004，but until now，bee experts haven't paid much attention to it．
When trying to find out why the bees were disappearing，a research team at Columbia University studied bee colonies （ 群体），some with and the others without decline．The research turned up large numbers of two types of fungi （真菌） once suspected of causing the bee decline．The research results，however，showed that the fungi were almost as common in colonies without a decline as they were in colonies with a decline．The researchers concluded that the two fungi probably weren't the cause．
Studies of the presence of IAPV，however，showed more interesting information．In those studies，done by a team at Pennsylvania State University in University Park，the virus showed up in 83percent of samples from colonies with symptoms （症状）．Only five percent of samples from symptomless colonies had it．
Scientists still don't know whether IAPIV can single--handedly cause the bee decline．They believe that even if the virus is making colonies sick，it could have a partner in crime．It's possible，for instance，that insects or chemicals in the environment weaken bees，making them more likely to catch IAPV．
Scientists are still trying to figure out how IAPV came to the United States．The United States currently allows bee products to be imported from Canada，Australia，and New Zealand．If it turns out that this trade is spreading disease，the rules might eventually change．

46．According to the passage，IAPV is a virus thatA．
A．hasn't attracted much attention
B．well-known to doctors and scientists
C．was first found by Austrian researchers
D．is dangerous to animals and human beings
47．The underlined word decline in the second paragraph most probably meansB．
A．disease   B．decrease   C．secret   D．growth
48．From the third and fourth paragraphs，we know researchers draw their conclusions by means ofC．
A．calculating  B．examining  C．comparing  D．investigating
49．The underlined sentence in the fifth paragraph probably meansC．
A．the virus could also cause other damages
B．there must be something that is the real cause
C．IAPV is not the only cause for the bee decline
D．the virus may be caused by the polluted environment
50．What still remains unknown to American scientists according to the passage？D
A．How and why to kill IAPV．
B．How to change the rules of the bee products trade．
C．Whether bee products should be imported．
D．How IAPV came to America．

6．Everywhere，you will find"the white-haired boy"，sometimes called"the fair-haired"boy．He gets special （36）A，as if he were above everybody else．You will find him in school，in college，at home，or （37）Cyou work．
In school，he is teacher's （38）A，her favorite who can do nothing （39）B．Sometimes she lets him do little jobs for her．He comes to class in the morning，all shiny and clean．"He is always raising his hand，（40）Dwith answers to the teacher's questions．And he knows all the answers．
He gets into your hair，especially if you are at the （41）Cof the class and die teacher thinks you are slow at learning things．How you （42）Athe guy!
At college，he walks across the school ground as if he （43）Cit．Sometimes he wears a，colorful football or basketball shirt or sweater，with a bright red，or green or yellow college letter （44）Dworn on the front of it．What （45）Bshoulders，what muscles he has!He （46）Athe girls happy by just smiling at them．He has the mark of （47）A on him．
At home，"the fair-haired boy"is （48）Bchoice．Sometimes，he is the oldest son-（49）D，the youngest．If you are in between，you are out of （50）B．
Then，you discover that there are others who （51）Cyour feelings，ready to tell you their private （52）D．One of them asks，"What does he have that I haven't got？"You ask yourself the same question．
（53）B，there comes a day when you decide to stop hating him．Is it （54）Cbecause he has been made boss and you （55）D yourself working for him？

36．A．treatment	B．belief	C．courage	D．encouragement
37．A．somewhere	B．anywhere	C．where	D．everywhere
38．A．pet	B．friend	C．workmate	D．child
39．A．correct	B．wrong	C．special	D．difficult
40．A．curious	B．willing	C．interested	D．ready
41．A．front	B．top	C．bottom	D．point
42．A．hated	B．envy	C．admire	D．like
43．A．brought	B．won	C．owned	D．gained
44．A．freely	B．quickly	C．delightedly	D．proudly
45．A．great	B．broad	C．manned	D．bright
46．A．makes	B．les	C．takes	D．keep
47．A．success	B．challenge	C．faith	D．innocence
48．A．Father's	B．Mother's	C．Sister's	D．Grandma's
49．A．seldom	B．never	C．usually	D．at times
50．A．pity	B．luck	C．shame	D．sight
51．A．understand	B．realize	C．share	D．reach
52．A．opinions	B．suggestions	C．expressions	D．thoughts
53．A．Gradually	B．Finally	C．Surprisingly	D．Actually
54．A．certain	B．true	C．perhaps	D．possible
55．A．see	B．know	C．notice	D．find

5．Fly into Lisbon and spend a couple of days exploring the capital，which is a terrific bargain．In addition to some worthwhile and affordable dining and lodging（住宿） choices，must-see sights include the Romanesque Lisbon Cathedral，which dates back to the 12th century，and the Moorish Alfama quarter，with its markets and winding cobblestone streets．Take a taxi or bus to the Belém district，where you'll find the Tower of Belém and the Jerónimos Monastery．After Lisbon，you can take a day trip，by train，to Sintra，a beautiful town nestled（依偎） against the hills about 20miles west of Lisbon； its castle and palaces，like the Sintra National Palace and the Pena National Palace，are well worth a visit．
To see the countryside，rent a car and drive southeast about 90minutes to the Alentejo region．Base yourself in ?vora，an architectural precious stone．By foot，explore its winding cobblestone streets，fountains and whitewashed houses．Attractions include the Roman Temple of ?vora．And make sure to hear some fado，the traditional music of Portugal（葡萄牙）．
Alternatively，head north from Lisbon to Oporto，about three hours，and then east to the winemaking region of the Douro River Valley．In his article Portugal Old，New and Undiscovered，Frank Bruni wrote："All around us mountains undulated（波动） into the distance．The slopes（斜坡）in the foreground were an amazing patchwork of greens，reds，browns and grays，as if some grand hand had fashioned it into a picture on all that nature and agriculture can do．"

68．You can NOT enjoy the beauty ofA in Lisbon．
A．the Sintra National Palace
B．the Moorish Alfama quarter
C．the Tower of Belém
D．Romanesque Lisbon Cathedral
69．In Alentejo region，a tourist canB．
A．walk by the sea bare feet
B．appreciate traditional music
C．enjoy a good view of the city
D．buy some precious stones cheap
70．Frank Bruni's words help the readers to get a better picture ofA．
A．Douro River Valley
B．Lisbon
C．Oporto
D．Portugal
71．The text is meant toA．
A．advise on travelling in Portugal
B．describe the beauty of Portugal
C．introduce the attractions in Lisbon
D．compare the city with the countryside．

4．The coast of the State of Maine is one of the most irregular in the world．A straight line running from the southernmost coastal city to the northernmost coastal city would measure about 225miles．If you followed the coastline between these points，you would travel more than ten times as far．This irregularity is the result of what is called a drowned coastline．The term comes from the glacial（冰川的）activity of the Ice Age．At that time，the whole area that is now Maine was part of a mountain range that towered above the sea．As the glacier descended，however，it applied enormous force on those mountains，and they sank into the sea．
As the mountains sank，ocean water charged over the lowest parts of the remaining land．And the highest parts of the former mountain range，nearest the shore，remained as islands．Marine fossils found here are 225feet above sea level indicating the level of the shoreline prior to the glacier．
The 2，500-mile-long rocky and jagged coastline of Maine keeps watch over nearly 2，000islands．Many of these islands are tiny and uninhabited，but many are home to blooming communities．Mt．Desert Island is one of the largest，most beautiful of the Maine coast islands left behind by the glacier．Measuring 16miles by 12miles，Mt．Desert was very nearly formed as two distinct islands．It is split almost in half by Somes Sound，a very deep and very narrow stretch of water seven miles long．
For years，Mt．Desert Island，particularly its major settlement，Bar Harbor，has afforded summer homes for the wealthy．Recently，though，Bar Harbor has become a new arts community as well．But the best part of the island is the unspoiled forest land known as Acadia National Park．Since the island sits on the border between two different geographical zones，the park supports the plants and animals of both zones．It also lies in a major bird migration lane and is a resting spot for many birds．
The establishment of Acadia National park in 1916 means that this natural monument will be preserved and that it will be available to all people，not just the wealthy．Visitors to Acadia may receive nature instruction from the park naturalists as well as enjoy camping，hiking，cycling，and boating．Or they may choose to spend time at the museum learning about the Stone Age inhabitants of the island．

72．The large number of small islands along the coast of Maine is the result ofB．
A．the drowning of the Maine coastline
B．glacier's forcing mountains into the sea
C．the irregularity of the Maine coastline
D．ocean water's flooding the mountain range
73．From the passage，we learn thatC．
A．the coastline of Maine is ten times longer after the Ice Age
B．there are more than 2500islands along the Maine coastline
C．Mt．Desert Island has been broken apart by a 7-mile-long water stretch
D．an arts community gave way to the summer homes on Mt．Desert Island
74．What CANNOT be inferred about the Acadia Nation Park？D
A．It welcomes all the people，rich or poor．
B．It has much appeal for bird-watching lovers．
C．It offers visitors both entertainment and education．
D．It is a border between the two geographical zones．
75．Which of the following might be the best title of the passage？A
A．The past and the present of Maine 
B．The formation of Maine coastline
C．Efforts for preserving national parks
D．Tourist attractions on Mt．Desert Island．

3．In the more and more competitive service industry，it is no longer enough to promise customer satisfaction．Today，customer"delight"is what companies are trying to achieve in order to keep and increase market share．
It is accepted in the marketing industry，and confirmed by a number of researchers，that customers receiving good service will promote business by telling up to 12 other people； those treated badly tell tales of worse to up to 20 people．Interestingly，80 percent of people who feel their complaints are handled fairly will stay loyal．
New challenges for customer care have come when people can obtain goods and services through telephone call centers and the Internet．For example，many companies now have to invest a lot of money in information technology and staff training in order to cope with the"phone rage"-caused by delays in answering calls，being cut off in mid-conversation or left waiting for long periods．
"Many people do not like talking to machines，"says Dr，Storey，Senior Lecturer in Marketing at City University Business School．"Banks，for example，encourage staff at call centers to use customer data to establish instant and good relationship with them．The aim is to make the customer feel they know you and that you can trust them-the sort of comfortable feelings people have during face-to-face chats with their local branch manager．"
Recommended ways of creating customer delight include：under-promising and over-delivering （saying that a repair will be carried out within five hours，but getting it done within two）； replacing a faulty product immediately； throwing in a gift coupon as an unexpected"thank you"to regular customers； and always returning calls，even when they are complaints．
Airlines face some of the toughest challenges over customer care．Fierce competition has convinced them that delighting passengers is an important marketing tool，while there is great potential for customer anger over delays caused by weather，unclaimed luggage and technical problems．
For British Airways staff，a winning telephone style is considered vital in handling the large volume of calls about bookings and flight times．The Airways also says its customer care policies are applied within the company and staff are taught to regard each other as customers requiring the highest standards of service．
Customer care is obviously here to stay and it would be a foolish company that used slogans such as"we do as we please"．On the other hand，the more customers are promised，the greater the risk of disappointment．

41．We can learn from Paragraph 2 thatD．
  A．complaining customers are hard to satisfy
  B．unsatisfied customers receive better service
  C．satisfied customers catch more attention
  D．well-treated customers promote business
42．The writer mentions"phone rage"（Paragraph 3）to show thatC．
  A．customers often use phones to express their anger
  B．people still prefer to buy goods online
  C．customer care becomes more demanding
  D．customers rely on their phones to obtain services
43．What does the writer recommend to create customer delight？
C 
  A．Calling customers regularly．   B．Giving a"thank you"note．
  C．Delivering a quicker service．  D．Promising more gifts．
44．Customer delight is important for airlines becauseB．
  A．their telephone style remains unchanged
  B．they are more likely to meet with complaints
  C．the services cost them a lot of money
  D．the policies can be applied to their staff
45．Which of the following is conveyed in this article？C
  A．Face-to-face service creates comfortable feelings among customers．
  B．Companies that promise more will naturally attract more customers．
  C．A company should promise less but do more in a competitive market．
  D．Customer delight is more important for air lines than for banks．

2．Friday，December 30，2011 has been cut for the tiny South Pacific island nation，Samoa as it moved its time zone 24 hours ahead to catch up with Asia，New Zealand and Australia． On New Year's Eve，Samoa will Slave jumped to the west of the international dateline，which runs through the Pacific Ocean and broadly follows the 180 degree line of longitude （经线）．
Its Prime Minister said it would make it easier for Samoa to trade with their key partners．"No longer shall we have people ringing us up on Monday from New Zealand and Australia thinking it is Monday when we are closing our eyes and praying at churches．And in the same way，on our Fridays when we ring up and already our contacts are holidaying on their Saturdays，"he told Radio New Zealand on Friday．
To help win public support，the government declared employers must still pay workers for the missing Friday，although banks will not be allowed to charge interest for the lost day．
Countries are free to choose whether the dateline passes to the east or west，and Samoa's decision means all new maps will need to change．But some tourism operators are worried Samoa will lose business by losing its position as the last place on earth to see the sunset each day，although it is now one of the first places to see in each new day．
Samoa，a country of about 180，000 people，used to be in the same time zone as New Zealand and Australia，but went back a day in 1892，celebrating July 4 twice and aligning itself with the United States．The date change is not the first major change in Samoa in recent years．In 2009，the country switched to driving on the left hand side of the road from the right hand side，in line with New Zealand and Australia．
71．Samoa moved its time zone 24 hours ahead toD   
   A．trade with the United States
    B．be the first place to see in each new day
    C．follow the international dateline
    D．be in the same time zone as Australia
72．Which of the following is true according to the text？A
A．It's Monday now in Samoa while it is Sunday in America．
    B．Samoa once had a date change about 200 years ago．
    C．Samoa and America are now in the same time zone．
    D．In Samoa，cars move on the right hand side of the road．
73．On the missing Friday，___ in Samoa，C
    A．banks still charged interest      B．all the people had a day off
    C．workers still got paid            D．all celebrated New Year's Eve
74．The underlined word"aligning"in the last paragraph possibly meansB．
    A．celebrating     B．adjusting        C．moving           D．trading
75．What's the text mainly about？D
    A．The change of international dateline．
    B．The first nation to greet New Year．
    C．A new neighbor of Australia．
    D．A new date change in Samoa．

1．The towers，called the Bosco Verticale，are under construction in Milan．Towering over the city skyline，these are the world'S first forest in the sky apartments．
With trees equal to 10，000 square meters of forest covering 27 floors，the twin towers will be home to an astonishing 730 trees，5，000 bushes and 11，000 ground plants．
Michele Brunello，director of Boeri Studios，explained，"The idea of a vertical forest came when we were involved in a local tree planting project．We imagined the building that allowed the landscape（景观）to enter it．"
Brunello'S concept is designed to save on land，which is a precious resource in the centre of a major city．"We can provide the quality of life of expensive housing without consuming the resources that conventional housing would demand．"he said．
Bosco Verticale has been designed as a home to a variety of plants，which planners hope will act as a filter（过滤器）to pollution from traffic，shade people from the sun and will change its appearance each season．
"People live with the trees but they don't own them-they are communal，"said Brunello．"All the plants have been picked by the designers to be suitable to the height and correct side of the building．So the people aren't just choosing an apartment based on the size and view，but also they need to consider which trees and plants they will be living with．"
Safety is also a major factor．If a tree Was blown down in the wind from a great height，this could be a huge problem．So we tested various trees to make sure we had the right ones．
When the sky forest is completed by the end of 2012，the structure will house the same amount of people as 50，000 square meters of conventional urban area．What'S more，it will be home to insects，birds and animals that usually live in the parks of Milan．
61．By saying"allowed the landscape to enter it"Brunello means thatC．
A．trees will be planted inside the building
B．the towers are part of the tree planting project
C．the landscape of trees and plants is part of the towers
D．the landscape of trees can be moved into the building freely
62．What does the underlined word"communal"probably mean？B
A．Expensive．    B．Public．    C．Dangerous．     D．Unaffordable．
63．Which of the following may not be considered when buying an apartment in Bosco Verticale？D
A．The size of the apartment．
B．The view of the apartment．
C．The different trees on the towers．
D．The amount of birds living with the trees．
64．Which isn't the benefit that the Bosco Verticale can bring to Milan？B
A．Cleaning the polluted air by traffic．
B．Lowering the conventional houses'price．
C．Changing its appearance with seasons．
D．Shading people from the sun．
65．Which of the following would be the best title for the text？D
A．Brunello creates a special park   
B．Bosco Verticale consumes less land
C．Italy will plant a variety oftrees  
D．Milan constructs towers of trees．

20．There are about 15，000-20，000 species of butterflies all over the world．They can be found on every continent except Antarctica．
To go to sleep，butterflies look for a safe place like the underside of a leaf or a branch，for example．Most butterflies sleep alone，but there are also species sleeping in groups．Poisonous butterflies have a particular smell that probably protects them better when they sleep together．It is also useful not to change the group'S sleeping place because a predator（食肉动物）who attacked a poisonous butterfly one time won't do this again．There is only a limited number of predators in an area so there is only a limited number to"educate"if the sleeping place stays the same．
One species from Costa Rica whose scientific name is Marpesia berania sleeps in groups on a leaf．If one butterfly of the group is disturbed，it opens its wings and touches its neighbors．Being touched，they open their wings as well and so the whole group is informed about the danger and Can escape together．
The speed of their flight depends on the way the butterfly flies：Blues and Whites normally have speeds under 8 km/h，the speed of Fritillaries is between 16 to 40 km/h and some Skippers reach speeds up to 60 km/h．
Besides warning and scaring predators with colors butterflies fly in a special way．The direction of their amazing flight is hard to predict．When they hear the sounds of a bat，the ones flying at night start a zigzag（之字形）flight in all directions：up and down，left and right．So it gets hard for the bat to catch them．
In the dark when colors don't function，some poisonous butterflies make clicking noises to warn bats that they are poisonous．Of course other species copy this sound to produce the protective effect，too．
56．The reason why butterflies don't change the group'S sleeping place is thatB
A．a predator would attack them again in the same place
B．few other predators would attack them in this fixed area
C．the predators would know they are poisonous
D．there are more predators in other places
57．The author takes Marpesia berania for example in order toC．
A．introduce where butterflies sleep at night
B．tell us how butterflies work together to defeat predators
C．introduce how butterflies sleeping in groups escape from danger
D．tell us that Marpesia berania is the most clever butterflies
58．What does Paragraph 4 mainly tell us？D
A．The different flight speeds of the butterfly．
B．Which butterfly flies at the highest speed．
C．Most butterflies fly at a low speed．
D．The different way the butterfly flies．
59．It'S hard for bats to catch butterflies because butterflies flyD．
A．much faster than bats   
B．aimlessly
C．at different speeds
D．in a zigzag way
60．Some poisonous butterflies warn predators in the dark byC．
A．scaring predators with colors
B．touching their neighbors with their wings
C．making clicking noises
D．copying bats'sound to confuse predators．