题目列表(包括答案和解析)
Direction：Read the following passage and answer the questions according to the imfomation you get in the passage and the required words limit．
Agricultural scientists in the United States have put a copy of a human gene into pigs, sheep and rabbits．They report that the gene seems to be working in some of the animals．The gene that the scientists are using controls the production of human growth hormone(荷尔蒙), a chemical necessary for growth．
They are using the human gene because it has been more closely studied than any other growth gene．The scientists hope their work will someday result in food animals that grow faster and larger or produce more milk or eggs．The research is being done by scientists at the University of Pennsylvania, the University of Washington and the United States Department of Agriculture．The scientists put copies of human growth hormone into the fertilized(受精的)eggs of the female animals．When baby animals were born from the eggs, the scientists looked for evidence that the human gene had become part of the animal’s genetic material．They examined almost 200 baby pigs and found the gene in 20 of them．They found it in 28 of more than 200 rabbits, but it was in only one of 73 baby sheep．The scientists said they found the human growth chemical produced by the gene in some of the animals．
It is too soon to know if the animals will pass the human growth gene into their young, proving that the gene has become part of their genetic material．Similar research with mice two years ago produced a new kind of mouse that is two times larger than normal．The scientists hope the same thing will happen with farm animals．They say their research will permit other gene transplants that can give animals defense against diseases, or let them live in very hot or very cold places．American farmers already use chemical hormones to increase the size of cattle and the amount of milk they produce．But they have to put the hormones into the cows．If the gene transplants are fully successful, the cow’s body will produce growth hormone．
1．How many kinds of animals have scientists put copies of human gene into?(no more than 1 word)
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2．Why do the scientists do such a research?(no more than 15 words)
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3．How does the gene work in the growth of animals?(no more than 8 words)
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4．What can we learn about the research with mice?(no more than 13 words)
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阅读下面短文，并按照题目要求用英语回答问题。
Scientists have tried to come up with biological explanations for the academic difference between boys and girls. However, none were believable enough to explain the general picture. As one scientist points out, there are slightly genetic differences between the sexes at birth which may affect the subjects boys and girls choose. “But the difficulty is that by the time children reach school age, there are so many other effects that it is almost impossible to tell whether girls are worse at science and maths, or whether they’ve been brought up to think of these subjects as boys’ ‘territory’”. Statistics show that in mathematics, at least, girls are equal to boys. A recent report suggests girls only stop studying mathematics because of social attitudes. One of the reports says, “While it is still acceptable for women to say that they are ‘hopeless’ at maths, our research shows that, although girls get marks which are as good as boys’, they have not been encouraged to do so. ” The explanation for the difference, which is very clear during the teenage years, goes as far back as early childhood experiences. From their first days in nursery school, girls are not encouraged to work on their own or to complete tasks, although boys are. For example, boys but not girls are often asked to “help” with repair work. This encouragement leads to a way of learning how to solve problems later in the life. Evidence shows that exceptional(杰出的)mathematicians and scientists did not have teachers who supplied answers; they had to find out them by themselves.
A further report on maths teaching shows that teachers seem to give more attention to boys than to girls. Most teachers who took part in the study admit that they expect their male students to do better at mathematics and science subjects than their female students. All of this tends to encourage boys to work harder in these subjects, gives them confidence and makes them believe that they can succeed. Interestingly, both boys and girls tend to regard such “male” subjects like mathematics and science as difficult. Yet it has been suggested that girls avoid mathematics courses, not because they are difficult, but for social reasons.
Mathematics and science are mainly male subjects, and therefore, as girls become teenagers, they are less likely to take them up. Girls do not seem to want to be in open competition with boys. Neither do they want to do better than boys，because they are afraid to appear less female, and so less attractive.
1. What has been discovered about boys and girls in their learning and choosing subjects at school? (No more than 20 words. )
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2. Please explain the underlined word “territory” in English. (No more than 6 words. )
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3. Why do girls stop learning mathematics based on the passage? (No more than 15 words. )
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4. What makes those who made extraordinary contribution in mathematics and science different? (No more than 15 words. )
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5. What conclusion can be drawn according to the scientific studies? (No more than 20 words. )
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