1. Paragraph 2 ___.
2. Paragraph 4___.
3. Paragraph 5___.
4. Paragraph 6___.
A. Keprike’s research tool
B. Dangers of Habitual shortages of sleep
C. Criticism on Kripke’s report
D. A way of overcoming insomnia
E. Sleep problems of long and short sleepers
F. Classification of sleep problems
5.To get a good night’s rest,people may not need to ___.
6.Long sleepers are reported to be more likely to___.
7. One of the sleep problems is waking in the middle of the night,unable to___.
8. One survey showed that people who habitually ___each night have a higher risk of dying.
A fall asleep again .
B become more energetic the following day
C sleep less than 7 hours
D confirm those serious consequences
E suffer sleep problems
F sleep more than 8 hours
答案: 1. E 2. B 3. A 4. D 5. F 6. E 7. A 8. C