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  3. At the beginning of last century, medical scientists made an interesting discovery: we are built not just of flesh and blood but

At the beginning of last century, medical scientists made an interesting discovery: we are built not just of flesh and blood but

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问题    At the beginning of last century, medical scientists made an interesting discovery: we are built not just of flesh and blood but also of time. They were【C1】______to show that we all have "a body clock" inside us, which controls the【C2】______and fall of our body energies, making us different from one day to the next.
   The【C3】______of "a body clock" should not be too surprising since the lives of most living things are controlled【C4】______the 24 hour night-and-day cycle. We feel tired and fall asleep at night and become【C5】______and energetic during the day. If the 24 hour-cycle is disturbed, most people experience unpleasant【C6】______For example, people who are not used to working at night can find that【C7】______of sleep cause them to perform badly at work.
  【C8】______the daily cycle of sleeping and waking, we also have other cycles which【C9】______longer than one day. Most of us would agree that we feel good on some days and not so good on【C10】______: sometimes our ideas seem to flow and at other times, they just do not exist.
【C9】
选项 A、repeat
B、remain
C、last
D、happen
答案C
解析 本题考查词义辨析和句意理解。根据后面的longer than one day可知，此处last意为持续。
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