— Please don’t ________ next time, Tommy.

— OK.

A.be quiet B.to be quiet C.arrive late D.to arrive late

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A new study says the habit of sleeping in（睡懶覺）on weekends may not be such a good idea for your health.

36 healthy young men and women took part in the study. They were divided into three groups and were followed over 30 days.

The first group could sleep for nine hours each night for the 30 days. The second group had other only five hours of sleep every night. The third group had five hours on weekdays but was allowed to sleep as long as they wanted on the weekend. But on Monday, the third group was put back to the sleep schedule（周期）of only five hours a night.

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1.How many groups were the people divided into in the study?

A.3 B.4 C.5 D.6

2.How long did the third group sleep everyday？

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D.5 hours on weekdays and sleep as long as they wanted on weekends.

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