There isn't any bread on the table , ?
A. is there
B. isn't there
C. has there
D. was there
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There a tallk about American Country music in our school tonight.
A. will have
B. is going to have
C. have
D. will be
There many trees here two years ago.
A. was
B. is
C. are
D. were
The radio says a cold day in south China tomorrow?
A. will be
B. will have
C. will get
D. there will be
双向晶闸管伏安特性曲线的正向部分位于第__________象限，反向部分位于第__________象限。
A. Ⅰ；Ⅱ
B. Ⅰ； Ⅲ
C. Ⅳ；Ⅱ
D. Ⅳ；Ⅲ
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