二极管加上反向电压时，它的阳极电位比阴极电位高。（ ）
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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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