题目内容

当导轨上行驶的汽车数量少时,传输效率将会非常低。

A. 对
B. 错

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双层多级导轨模式的稳定性差。

A. 对
B. 错

Now ___ your turn to recite the text.

A. there is
B. there comes
C. comes
D. has come

Not a single mistake ____ in the dictation yesterday.

A. did he make
B. made by him
C. he made
D. he had made

Not only __ a promise, but also kept it.

A. had he made
B. he had made
C. did he make
D. he makes

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