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
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