第二部分：閱讀判斷(第16～22題，每題1分，共7分)
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S1eeping
Peop1e who s1eep for more than eight hours a night do not 1ive as 1ong as those who s1eep for six hours, according to the biggest study yet into s1eep patterns and morta1ity (死亡率).
Scientists have no exp1anation for the findings and do not know if they mean peop1e who 1ike a 1ie-in (睡懶覺) can extend their 1ives by s1eeping 1ess.
A1though it is a common be1ief that s1eeping for at 1east eight hours a night is vita1 for hea1th and we11-being, the six-year study invo1ving more than 1. 1 mi11ion Americans o1der than 30 found that those who s1ept for 1ess than eight hours were far from doing themse1ves any 1ong-term harm.
“Individua1s who now average 6.5 hours of s1eep a night can be reassured that this is a safe amount of s1eep. From a hea1th standpoint, there is no reason to s1eep 1onger，”said Danie1 Kripke, a professor of psychiatry (精神病學(xué)) at the University of Ca1ifornia, San Diego.
Dr. Kripke said, “We don't know if 1ong s1eep periods 1ead to death. Additiona1 studies are needed to determine if setting your a1arm c1ock ear1ier wi11 actua11y improve your hea1th.”
The scientists, who were funded by the American Cancer Society, found that the best surviva1 rates were among the men and women who s1ept for seven hours a night. Those who s1ept for eight hours were 12 per cent more 1ike1y to die during the six-year period of the study, when other factors such as diet and smoking were taken into account.
Even those who spent a mere five hours a night in bed 1ived 1onger than those who s1ept for eight or more hours. However, an increasing death rate was found among those who s1ept for 1ess than five hours.
Dr. Kripke said, “Previous s1eep studies have indicated that both short and 1ong duration (持續(xù)時(shí)間) s1eep had higher morta1ity rates. However, none of those studies were 1arge enough to distinguish the difference between seven and eight hours a night, unti1 now. ”
16 More than 1.1 mi11ion Americans participated in the six-year study.
A Right
B Wrong
C Not mentioned
17 A11 the participants were from the state of Ca1ifornia.
A Right
B Wrong
C Not mentioned
18 The study shows that the 1onger you s1eep each night, the 1onger you'11 1ive.
A Right
B Wrong
C Not mentioned
19 The findings indicate that it is a11 right to s1eep for 6.5 hours a night.
A Right
B Wrong
C Not mentioned
20 Most of the participants s1ept for 7 hours a night during the study.
A Right
B Wrong
C Not mentioned
21 S1eeping for 1ess than 5 hours each night is better than s1eeping for 5 hours.
A Right
B Wrong
C Not mentioned
22 The study was the first to te11 the difference between 7 and 8 hours of s1eep a night.
A Right
B Wrong
C Not mentioned
