5．We are trying to build a better socialsystem（体系）．

3．Well，we will have totake a chance（冒险）．

2．She was born in China，but she wasbrought（抚养）up in America by her uncle．

1．Life on land probably began about 430million years ago，thought it had existed in the water for perhaps as long as 3，000million years．When we think of the first life on land，we probably think of strange animals coming out of the oceans，but，in fact，no animals could have been living if plants had not been on land first．Plants had to be on land before animals arrived．They supplied the first land animals with food necessary to live，since they-the plants are the only form of life that is able to get and store energy．
The first plants to exist out of the water were probably certain kinds of algae（海藻）which were followed by other plants that grew close to the ground near water and needed water in which to reproduce．Once the move to land had been made，however，evolution（进化）took place quickly．By the end of 100million years，plants had developed their roots，and some developed tall tree-like forms，since height was very important in competition for sunlight．About 300million years ago，much of the world was covered with forests of huge trees．
In most ways they were like modern trees．They had roots，leaves，wood，but mostly they had not developed seeds．

28The main idea of the first paragraph isC．
A Life on land probably began about 4，300years ago
B The first animal on land came from oceans
C There wouldn't be animals without plants
D Plants are the only form of life that is able to get and store energy
29Plants with roots appeared aboutC       million years ago．
A.430         
B.330          
C.300            
D.100
30  The first trees were like modern trees in most ways except thatC．
A They do not have branches   
B．They do not have flowers
C．They do not have seeds     
D．They do not need sunlight．

20．Once a New Zealand teacher asked where I live．"In the white building，"I answered．"At our university both girls and boys live in the same dormitory．"I added．Beyond my expectation（出乎意料），however，my attempt（努力）to show I am speaking American English（AE） turned out to be something else．The New Zealander seemed very puzzled（迷惑）at my answer．With a half smile，she asked，"Really？Do they live in the same room？""Oh，no．They live in different rooms but in the same building．"I reacted（反应）quickly．
Later I got to know the word"dormitory"．In AE it means one building，whereas（而，却）it means one room in  British English（BE）．The New Zealander misunderstood me because she spoke New Zealander English（NE），which，as we know，is much related to BE．
Nowadays，not a few English learners，who try to catch up with the fashion（时髦），choose to speak AE．
Yet，the problem is that they cannot speak pure AE，but half AE and half BE instead．I think it necessary to keep one style in order to avoid（避免）misunderstanding．

24．Which of the following is right？C
A．AE and BE are two different languages．
B．New Zealanders speak BE．
C．There are some differences between AE and BE．
D．New Zealanders cannot understand Americans．
25．What I said to the New Zealander is．A
A．really pure AE
B．really pure BE
C．half AE and  half BE
D．not English at all
26．According to the passage，D．
A．few people speak AE 
B．more people speak BE
C．BE is becoming fashionable
D．AE is becoming fashionable
27．The writer wrote the passage in order toC．
A．tell us a funny story
B．warn us not to make mistakes
C．encourage us to speak one style of English
D．tell us the differences between AE and BE．

19．Body and Food
Your body，which has close relations with the food you eat，is the most important thing you own，so it needs proper treatment and proper nourishment （营养）．The old saying"An apple a day keeps the doctor away"is not as silly as some people think．The body needs fruit and vegetables because they contain vitamin C．Many people take extra vitamins in pill form，believing that these will make them healthy．
But a good diet is made up of nourishing food and this gives all the vitamins you need．The body doesn't need or use extra vitamins，so why waste money on them？
In the modern western world，many people are too busy to bother about eating properly．They throw anything into their stomachs，eating hurriedly and carelessly．The list of illnesses caused or made worse by bad eating habits is frightening．

21．"Your body has close relations with the food you eat．"It really means thatA．
A．what you eat has great effect on your health
B．your body is made up of the food you eat
C．all kinds of food you eat can be made into your body
D．the more you eat，the fitter you will feel
22．The old saying referred to in the passage tells us thatA．
A．eating apples regularly does lots of good to our health
B．the apple is the best among all kinds of fruits
C．apples can take the place of doctors
D．an apple is a sure cure for illness
23．In the modern western countriesB．
A．people don't want to pay more attention to their eating
B．lots of people's illnesses are caused or made worse by bad eating habits
C．people throw everything into their stomachs without chewin
D．people are only too busy to cook meals for themselves．

18．This is __________challenging job I mentioned to you the other day．Have you had anyone in __________  mind for it now？（　　）

A．

a； the

B．

a；/

C．

the；/

D．

the； the

17．A lot of people are determinedto become（become） a millionaire．

16．Mr．Lee was in bed and was trying to go to sleep when he heard the bell ring．He turned on the light and looked at his clock．It was twelve o'clock．"Who can it be at this time of night？"He thought．He decided to go and find out．So he got of bed，put on his dressing gown （浴袍） and went to the door．When he opened the door，there was nobody there．"That is very strange．"Then he went back to his bedroom，took off his dressing gown，got back into bed，turned off the light and tried to go to sleep．
　　A few minutes later he heard the bell again．Mr．Lee jumped out of bed very quickly and rushed to the door．He opened it，but again he found no one there．He closed the door and tried not to feel angry．Then he saw a piece of paper on the floor．He picked it up．There were some words on it："It is now after midnight，so it is April Fool's Day．April fool to you!"
"Oh，it was the English boy next door!"Mr．Lee exclaimed （惊叫） and almost smiled．He went back to bed and feel asleep at once．The bell did not ring again．

16．When did Mr．Lee go to bed？
He went to bedA．
A．before twelve o'clock      B．after twelve o'clock
C．when the bell rang          D．when he saw the boy
17．Why did he rush to the door when he heard the bell ring the second time？B
A．He wanted to open the door for the visitor
B．He wanted to find out who the visitor was．
C．He was afraid of the ring
D．He was waiting for someone．
18．From this passage，we learn that we canCon April Fool's Day．
A．say"Hello"to each other     B．dance and sing at night
C．play jokes on each other      D．send presents to children
19．What did Mr．Lee think about the English boy？
He thought heB．
A．was a good boy                         B．was friendly with him
C．shouldn't ring the bell at midnight    D．did a dangerous thing just now．