题目内容：
根据短文的内容回答，下列题目Sleep-Smart
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 Sleep-Smart, measures your sleep cycle, and waits __________ (51) you to be in your lightest phase of sleep before arousing you. Its makers say that should __________ (52)you wake up feeling refreshed every morning.
As you sleep you pass through a sequence of sleep states--light sleep, deep sleep and REM(rapid eye movement) sleep- that __________ (53) approximately every 90 minutes. The point in that cycle at which you wake can __________ (54)how you feel later, and may even have a greater impact than how much or little you have slept. Being amused during a light phase __________ (55)you are more likely to wake up energetic.
Sleep-Smart __________ (56) the distinct pattern of brain waves produced during each phase of sleep, via a headband equipped __________ (57) electrodes (电极) and a microprocessor. This measures the electrical activity of the wearer's brain, in much the __________ (58) way as some machines used for medical and research __________ (59), and communicates wirelessly with a clock unit near the bed. You __________ (60)the clock with the latest time at __________ (61)you want to be wakened, and it then duly (适时地) wakes you during the sleep phase before that.
The __________ (62) was invented by a group of students at Brown University in Rhode Island__________ (63) a friend complained of waking up tired and performing poorly on a test.
" __________ (64) sleep-deprived (剥夺) people, we started thinking of __________ (65) 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.
_____________ A．beside
B．near
C．for
D．around
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