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举一反三
【单选题】Peter, John and Tom each _____.(2012三明)
A.
say they came first
B.
says they came first
C.
says he came first
D.
say came first
【单选题】转基因抗虫棉可以有效地用于棉铃虫的防治。在大田中种植转基因抗虫棉的同时,间隔种植少量非转基因的棉花或其他作物,供棉铃虫取食。这种做法的主要的是 ( )
A.
维持棉田物种多样性
B.
减缓棉铃虫抗性基因频率增加的速度
C.
使食虫鸟有虫可食
D.
维持棉田生态系统中的能量流动
【单选题】—Who did you go to the library _____,Tina?—Nobody. I went alone. (2013三明)
A.
about
B.
with
C.
for