题目内容

二极管加上反向电压时,它的阳极电位比阴极电位高。( )

A. 对
B. 错

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Where ____Lucy come from?

A. do
B. does
C. is
D. are

Most of the students _________China

A. comes from
B. is from
C. are from
D. come of

-Were you often late for school early every day.–No, _________I got to school early every day.

Always
B. Usually
C. Sometimes
D. Never

-John sings so well. Has he ever been trained?-No. He learns all by himself. He _________goes to any training class.

A. usually
B. often
C. never
D. even

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