题目内容

规定自负极通过电源内部指向正极的方向为电动势的方向。( )

A. 对
B. 错

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A robot ___ think for itself. It must be told what to do.

A. can't
B. couldn't
C. may not
D. might not

Let's go on a picnic, ___?

A. shall we
B. will you
C. may we
D. could you

You ___ carry the luggage for me, for I only have one bag.

A. needn't
B. can't
C. mustn't
D. wouldn't

"___ he use your bike now?""Certainly. Here is the key.

A. Does
B. Must
C. Shall
D. Will

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