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20．What does the woman suggest the man doing？
A．Spending more time．
B．Talking more with Americans．
C．Studying harder．

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科目：高中英語 來源： 題型：信息匹配

3．Are you sick of going to bed late and waking up tired？（36）F A new study suggests that a couple days of camping in the great outdoors can reset your circadian clock and help you get more sleep．
The circadian clock，more commonly known as the body clock，is an internal system that tells our bodies when it's time to go to sleep and when it's time to wake up．（37）C
In a healthy sleeper，melatonin levels rise a few hours before bedtime，stay high through the night，and then settle back down when it's time to wake up．
In our modern society，however，most of us stay up many hours past sunset and would probably sleep in many hours after sunrise if we could．（38）G It may also have other health consequences as well，such as diabetes，overweight and heart disease．
Professor Kenneth Wright of the University of Colorado in the US wanted to see if our body clocks can be reset by a short stay in nature．（39）E Nine went on a weekend camping trip，while the other five stayed home．
At the end of the weekend，the researchers reported that in just two days，the campers'body clocks had shifted so that their melatonin levels began to rise more than an hour earlier than they did before they left on the trip．（40）B

A．He prepared a lot for the research，and asked many friends to help him．
B．By contrast，the body clocks of the group that stayed home shifted even later over the course of the weekend．
C．Scientists track this clock by measuring the amount of melatonin （褪黑激素） circulating in a person's blood at any given time．
D．Now you have a good solution．
E．His team recruited 14physically active volunteers in their 20s and 30s．
F．Then grab your hiking boots and a tent．
G．And the trouble is，your melatonin levels may still be high when your alarm clock goes off in the morning，which leads to grogginess．

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