The traditional view is _____ we sleep b

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问题选择题

The traditional view is _____ we sleep because our brain is "programmed" to make us do so.

A. when
B. why
C. whether
D. that

答案

答案：D

选择题

Even if the treatment ________, there is still no magic pill for the patients in the last stage of AIDs.

A．works

B．uses

C．does

D．helps

填空题

我国电网电压的频率f=（），即交流电每秒变化（），习惯上称为工频。