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  3. Do you wake up every day feeling too tired, or even upset? If so, then a new alarm clock could be just for you. The clock, c

Do you wake up every day feeling too tired, or even upset? If so, then a new alarm clock could be just for you. The clock, c

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问题     Do you wake up every day feeling too tired, or even upset? If so, then a new alarm clock could be just for you.
    The clock, called SleepSmart, measures your sleep cycle, and waits【C1】______ you to be in your lightest phase of sleep【C2】______ rousing you. Its makers say that should【C3】______ you wake up feeling refreshed every morning.
    As you sleep you pass【C4】______ a sequence of sleep states—light sleep, deep sleep and REM (rapid eye movement) sleep—that【C5】______ approximately every 90 minutes. The point in that cycle at which you wake can【C6】______ how you feel later, and may【C7】______ have a greater impact than how much or little you have slept. Being roused during a light phase【C8】______ you are more likely to wake up energetic.
    SleepSmart【C9】______ the distinct pattern of brain waves【C10】______ during each phase of sleep, via a headband equipped【C11】______ electrodes (电极) and a microprocessor. This measures the electrical activity of the wearer’s brain, in much the【C12】______ way as some machines used for medical and research【C13】______ , and communicates wirelessly with a clock unit near the bed. You【C14】______ the clock with the latest time at【C15】______ you want to be wakened, and it【C16】______ duly(适时地) wakes you during the last light sleep phase before that.
    The【C17】______ was invented by a group of students at Brown University in Rhode Island【C18】______ a friend complained of waking up tired and performing poorly on a test.’’【C19】______ sleep-deprived people ourselves, we started thinking of【C20】______ to do about it," says Eric Shashoua, a recent college graduate and now chief executive officer of Axon Sleep Research Laboratories, a company created by the students to develop their idea.
【C15】
选项 A、where
B、this
C、which
D、that
答案C
解析 语法结构。分析句子结构可知，at______you want to be wakened是一个定语从句，修饰前面的the latest time。句中需要填一个关系代词作at的宾语，介词之后只能用which而不能用that，所以C项为正确答案。
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