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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【B1】______you to be in your lightest phase of sleep【B2】______rousing you. Its makers say that should【B3】______you wake up feeling refreshed every morning.
    As you sleep you pass 【B4】______ a sequence of sleep states—light sleep, deep sleep and REM (rapid eye movement) sleep—that 【B5】______ approximately every 90 minutes. The point in that cycle at which you wake can【B6】______how you feel later, and may 【B7】______ have a greater impact than how much or little you have slept. Being roused during a light phase【B8】______you are more likely to wake up energetic.
    SleepSmart【B9】______the distinct pattern of brain waves【B10】______during each phase of sleep, via a headband equipped【B11】______electrodes and a microprocessor. This measures the electrical activity of the wearer’ s brain, in much the【B12】______way as some machines used for medical and research【B13】______, and communicates wirelessly with a clock unit near the bed. You【B14】______the clock with the latest time at【B15】______you want to be wakened, and it【B16】______duly wakes you during the last light sleep phase before that.
    The【B17】______was invented by a group of students at Brown University in Rhode Island【B18】______a friend complained of waking up tired and performing poorly on a test. "【B19】______sleep-deprived people ourselves, we started thinking of【B20】______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.
【B15】
选项 A、where
B、this
C、which
D、that
答案C
解析 考查语法知识——定语从句的引导词。分析句子可知，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．which为正确答案。
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