题目内容
20.听第10段材料,回答第17至20四个小题.17.How long does a jet lag usually last?
A.For 3 or 4 days. B.24 hours. C.5 hours.
18.What's the benefit of the drug?
A.It can help people sleep well.
B.It can help people adapt to the change.
C.It can reduce the pressure.
19.Who can benefit from the drug?
A.People who like sleeping.
B.People who are easy to be tired.
C.People who worked different shifts at irregular hours.
20.How many days does it take to recover from crossing 1 time zone?
A.1 day.B.2 days.C.3 days.
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