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Questions 16 to 18 are based on the passage you have just heard.
16
A.Four to six hours.
B.Six to nine hours.
C.Around eight hours.
D.More than eight hours.
17
A.They may not be able to focus well.
B.They may get the feeling of being drunk.
C.They may lose much weight in a short period.
D.They may suffer from high blood pressure.
18
A.Training can make people sleep less temporarily.
B.Military people are used to being deprived of sleep.
C.People can bank sleep by sleeping more beforehand.
D.Sleeping earlier than usual makes people sleep less.
