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SleepSmart is a clock that As you sleep, the headband

admin2008-09-21  37
问题 SleepSmart is a clock that
As you sleep, the headband
选项 A、analyses your sleep cycle every 90 minutes.
B、records the time when you fall into deep sleep.
C、communicates wirelessly with a computer,
D、measures the electric activity of your brain.
答案D
解析
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