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Four people in England back in 1953, stared at Photo 51,It wasn¡¯t much¡ªa picture showing a black X£®But three of these people won the Nobel Prize for figuring out what the photo really showed ¨Cthe shape of DNA The discovery brought fame and fortune to scientists James Watson, Francis Crick, and Maurice Wilkins£®The fourth, the one who actually made the picture, was left out£®
Her name was Rosalind Franklin£®¡± She should have been up there,¡± says historian£¨Àúʷѧ¼Ò£© Mary Bowden£®¡± If her photos hadn¡¯t been there, the others couldn¡¯t have come up with the structure£®¡± One reason Franklin was missing was that she had died of cancer four years before the Nobel decision£®But now scholars£¨Ñ§Õߣ©doubt that Franklin was not only robbed of her life by disease but robbed of credit by her competitors
At Cambridge University in the 1950s, Watson and Click tried to make models by cutting up shapes of DNA¡¯s parts and then putting them together£®In the meantime, at King¡¯s College in London, Franklin and Wilkins shone X-rays at the molecule(·Ö×Ó)£®The rays produced patterns reflection the shape£®
But Wilkins and Franklin¡¯s relationship was a lot rockier than the celebrated teamwork of Watson and Crick, Wilkins thought Franklin was hired to be his assistant£®But the college actually employed her to take over the DNA project£®
What she did was produce X-ray pictures that told Watson and Crick that one of their early models was inside out£®And she was not shy about saying so£®That angered Watson, who attacked her in return, ¡°Mere inspection suggested that she would not easily bend£®Clearly she had to to go or be put in her place£®¡±
As Franklin¡¯s competitors, Wilkins, Watson and Crick had much to gain by cutting her out of the little group of researchers, says historian Pnina Abir-Am£®In 1962 at the Nobel Prize awarding ceremony, Wilkins thanked 13 colleagues by name before he mentioned Franklin, Watson wrote his book laughing at her£®Crick wrote in 1974 that ¡°Franklin was only two steps away from the solution£®¡±
No, Franklin was the solution£®¡°She contributed more than any other player to solving the structure of DNA£®She must be considered a co-discoverer,¡± Abir-Am says£®This was backed up by Aaron Klug, who worked with Franklin and later won a Nobel Prize himself£®Once described as the ¡°Dark Lady of DNA¡±, Franklin is finally coming into the light£®
1.What is the text mainly about?
A£®The disagreements among DNA researchers
B£®The unfair treatment of Franklin£®
C£®The process of discovering DNA£®
D£®The race between two teams of scientists£®
2.Watson was angry with Franklin because she £®
A£®took the lead in the competition
B£®kept her results from him
C£®proved some of his findings wrong
D£®shared her data with other scientists
3.Why is Franklin described as ¡°Dark Lady of DNA¡±?
A£®She developed pictures in dark labs£®
B£®She discovered the black X-the shape of DNA£®
C£®Her name was forgotten after her death£®
D£®Her contribution was unknown to the public£®
4.What is the writer¡¯s attitude toward Wilkins, Watson and Crick?
A£®Disapproving£®
B£®Respectful£®
C£®Admiring£®
D£®Doubtful£®
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There are three separate sources of danger in supplying energy by nuclear power£®
First, the radioactive (ÓзÅÉäÐÔµÄ) material must travel from its place of production to the power station£® Although the power stations themselves are strongly built, the containers used for the transport of the materials are not£® Normally, only two methods of transport are in use, namely road or rail£® Unfortunately, both of these may have an effect on the general public, since they are sure to pass near, or even through, heavily populated areas£®
Second, there is the problem of waste£® All nuclear power stations produce wastes that in most cases will remain radioactive for thousands of years£® It is impossible to make these wastes non-radioactive, and so they must be stored in one of the inconvenient ways that scientists have invented£® For example, they may be buried under the ground, or dropped into deserted mines, or sunk in the sea£® However, these methods do not solve the problem, since an earthquake could easily break the containers£®
Third, there may occur the danger of a leak (й©) or an explosion at the power station£® As with the other two dangers, this is not very likely, so it does not provide a serious objection (²»Ô޳ɣ¬·´¶Ô) to the nuclear program£® However, it can happen£®
Separately, these three types of dangers are not a great cause for worry£® Taken together, though, the probability of disaster is extremely high£®
1.Which of the following is not true?
A£®It is likely that a leak or an explosion occurs at a power station£®
B£®It is not usual for radioactive materials to be conveyed across land£®
C£®The containers are likely to be broken by an earthquake£®
D£®Nuclear wastes remain risky in most cases for many years£®
2.The author thinks that the ways to store nuclear wastes are __________£®
A£®easy B£®impossible
C£®reasonable D£®ineffective
3.What do we learn from the last paragraph?
A£®The power station is a place that frees from danger£®
B£®The dangers of nuclear energy could be prevented£®
C£®The general public are opposed to the nuclear program£®
D£®By itself, none of the three dangers is very likely to lead to much worry£®
4.What is this passage about?
A£®Uses of nuclear power£®
B£®Dangers from nuclear power£®
C£®Public anger at nuclear power£®
D£®Accidents caused by nuclear power£®
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It is a great ______ to hear such beautiful music in the concert hall£®
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When I was small and my grandmother died, I couldn¡¯t understand why I had no tears£®But that night when my dad tried to cheer me up, my laugh turned into crying£®
So it came as no surprise to learn that researchers believe crying and laughing come from the same part of the brain£®Just as laughing has many health advantages, scientists are discovering that so, too, does crying£®
Whatever it takes for us to reduce pressure is important to our emotional(Çé¸ÐµÄ) health, and crying seems to work well£®One study found that 85 % of women and 73% of men report feeling better after crying£®
Besides, tears attract help from other people Researchers agree that when we cry, people around us become kinder and friendlier and they are more ready to provide support and comfort£®Tears also enable us to understand our emotions better; sometimes we don¡¯t even know we¡¯re very sad until we cry£®We learn about our emotions through crying, and then we can deal with them£®
Just as crying can be healthy, not crying ¨C holding back tears of anger, pain or suffering- can be bad for physical(ÉíÌåµÄ) health£®Studies have shown that too much control of emotions can lead to high blood pressure, heart problems and some other illnesses£®If you have a health problem, doctors will certainly not ask you to cry£®But when you feel like crying, don¡¯t fight it£®It¡¯s a natural ¨C and healthy- emotional response(·´Ó¦)¡£
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I¡¯d like to say anything about the service in our school dining hall£®In general£¬the service is satisfied£®The hall is clean and tidy£®And dishes look inviting and tastes good£®What¡¯s more£¬the workers there treat us as their friends£¬which makes us real happy£®However£¬the cost of the meals was a little high£®Also£¬we have only a limited variety of dish which are the same every day£®In addition£¬we often have to stand with line for a long time after we get our food£®This wastes a lot of time£®I hope something can be done to solve about these problems soon£®
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It¡¯s a time when school£¬homework£¬active social lives and pare-time jobs keep teenagers busy from early in the morning until late at night£®They are likely to try to make up for a lack of sleep by ¡°sleeping in¡± on the weekends£®Unfortunately£¬this causes irregular sleep and actually makes the problem worse£®
Most teenagers are not able to fall asleep until late at night£®Since many teens aren¡¯t sleepy until around 11 pm£®but need to be at school by 7:30 or 8:00 am £®They cannot get enough sleep £®During puberty(Çà´ºÆÚ)£¬the biological clock in the brain naturally re-sets to a later time £¬and this causes teens to fall asleep later£®Then £¬when it¡¯s time to get up £¬a teen¡¯s body clock is likely to still be producing the night-time hormones £®This makes it hard for them to feel active and energetic in the morning£®
A growing body of research suggests that starting high school later improves attendance£¬achievements and grades£®A few years ago in an important study £¬test scores on the SAT college entrance exams in Edina£¬Minnesota jumped more than 100 points on average£¬when the morning school bell rang an hour later£®Unfortunately£¬most schools are not set up to start later and fail to satisfy teen¡¯s sleep needs£®
1.What effect does ¡°sleeping in¡± on the weekends have on teenagers?
A£®Improving their health
B£®Weakening their energy
C£®Disturbing their biological clock
D£®Making up for their hormone loss
2.The study in Minnesota shows that starting morning school one hour later helps to______£®
A£®make teenagers grow faster
B£®change teenagers¡¯ sleep needs
C£®do more research on teenagers
D£®improve students¡¯ achievements
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Haikou¡ªA shark was killed after being dragged to shore at Yalong Berth beach in Sanya, South China¡¯s Hainan Province, on Sunday afternoon£®
It was the first time a shark had been caught in the beach area, a popular tourist site in Hainan£®
Local fishermen said they caught the 3-meter-long, l-ton shark by chance when they were fishing in sea water 1,000 metres deep near the beach£®
Police temporarily protected the shark while oceanographers(º£Ñóѧ¼Ò) decided whether it was a species belonging to State protection£®
Fishermen later killed and sold the shark after oceanographers confirmed that it was a whale shark and therefore not under State protection£®
The shark was believed to have drifted into the area from the deep sea due to strong waves caused last week by Typhoon Imbudo£®It had no open injuries but experts said they believed it suffered from internal bleeding£®
Local police officer Fu Chenggeng said beachgoers should not feel threatened by sharks because the fish never attack human beings on their own initiative£®Fu said he had never heard of any shark attacks at the Sanya beach since he first started work there eight years ago£®
However, police said they will improve the security system to safeguard tourists¡¯ safety on the beach£®
1.A possible title of the article should be______£®
A£®Tourists in Danger
B£®Killing Whale Shark
C£®Shark Caught in Beach Area
D£®Whale Shark in Danger
2.From the article it can be learned______£®
A£®the shark was caught because of obvious injuries
B£®the number of the whale shark may be small
C£®typhoon Imbudo may have brought the shark to the area
D£®it¡¯s not unusual to see a shark on the beach
3.The underlined word¡°confirmed¡±probably means______£®
A£®said B£®believed
C£®thought D£®made sure
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