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冲刺2008高考英语模拟试题 (十三) 下 (含答案)

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Scientists studied 24 people who had to stay awake for 40 hours straight. Then. they took tests that measured how well they could remember lists of numbers.     Results showed that the people with the short form of period3 performed much better than those with the long form did. In both groups, people performed worst in the early morning. After the first round of experiments, participants were finally allowed to sleep. People in the group that performed well on the tests took about 18 minutes to nod off(瞌睡) People with long period3 gene fell asleep in just 8 minutes. They also spent more time on deep sleep. That suggests that people with the long form of the gene need more and deeper sleep to keep their brains working in top form.     I think I must have the long form period3. What about you? 58. The purpose of the writer in the first paragraph is to ____________.     A. show his /her envy of those energetic people     B. show his /her poor memory for things     C. attract readers to the topic of the passage     D. prove his/her need for sleep 59. Whether you can stay up or not depends on___________.     A. the size of your brain        B. your will     C. your health                 D. the kind of genes you have

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