题型：阅读理解 题类：常考题 难易度：普通
河北省唐山市2019-2020学年高二上学期英语期末考试试卷（含小段音频）
A genetic variant(基因变体) that allows people to feel fully rested with fewer than six hours sleep a night has been found. It is the second such finding in recent months.
Ying-Hui Fu at the University of California, San Francisco, and her colleagues have been seeking out genetic variants responsible for short sleep and genetically engineering these variants into mice to confirm their effect. In August the team found a variant in a gene called ADRB1, which allows 12 members of a family to sleep 4.5 hours per night without feeling tired.
Now the team has found a variant in a gene called NPSR1 in another family, in which one sleeps averaged 5.5 hours a night and the other just 4.3 hours, feeling fully rested. Another variant in NPSR1 has previously been linked to people requiring 20 minutes less sleep than average, based on studies of tens of thousands of people.
Generally, long-term lack of sleep can contribute to many disorders, including obesity, heart disease, high blood pressure and depression. As far as Fu's team has been able to tell, however, people who sleep less with one of these gene variants are healthy and don't appear to suffer any ill effects. However, to be absolutely sure would require long-term studies involving large numbers of people, which is not feasible(可行的).
It might be possible to develop drugs that mimic the effects of these variants. However, as NPSR1 is also involved in processes such as stress, anxiety and fear, there is a risk of serious side effects.
King's College Summer School is a training program every year for high school students at all levels who want to improve their English. Courses are given by the teachers of King's College and other colleges in New York. Trips to museums and culture centers are also organized. This year's summer school will be from July 25 to August 15.
More information is as follows:
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Application date Students in New York should send their applications before July 18, 2007. Students of other cities should send their applications before July 16, 2007. Foreign students should send their applications before July 10, 2007. |
Courses English Language Spoken English: 22 hours Reading and Writing: 10 hours American History: 16 hours American Culture: 16 hours |
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Steps A letter of self-introduction A letter of recommendation(推荐) ﹡ The letters should be written in English with all the necessary information. |
Cost Daily lessons: $200 Sports and activities: $100 Travels: $200 Hotel service: $400 ﹡You may choose to live with your friends or relatives in the same city. |
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Please write to: Thompson, Sanders 1026 King' s Street New York, NY 10016, USA E-mail: KC-Summer-School@ yahoo, com |
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