Like most creatures on earth, humans come equipped with a circadian clock. Even though the average adult needs eight hours of sl

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问题 Like most creatures on earth, humans come equipped with a circadian clock. Even though the average adult needs eight hours of sleep per night, there are "short-sleepers" who need far【C1】________sleep, and morning people who often come from families of other morning people. Then there’s the rest of us, who【C2】________alarm clocks to get up in the morning.
  For those who fantasize about greeting the dawn, there is【C3】________. Sleep experts say that with a little discipline (well actually, a lot of discipline), most people can【C4】________their circadian clocks. But it’s not as simple as forcing yourself to go to bed earlier. It requires inducing a sort of jet lag without【C5】________your time zone. And sticking it out until your body【C6】________resets itself. And then not resetting it again.
  To start, move up your wake-up time by 20 minutes a day. If you【C7】________rise at 8 a.m., but really want to get moving at 6 a.m., set the alarm for 7:40 on Monday. The next day, set【C8】________for 7:20 and so on. Then, after you wake up, don’t【C9】________in bed. Hit yourself with light. In theory, you’ll gradually get sleepy about 20 minutes earlier each night, and you can facilitate the transition by avoiding【C10】________light exposure from computers or televisions as you near bedtime.
【C8】

选项 A、one
B、that
C、it
D、another

答案C

解析 it指代上文提到的the alarm。
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