题目内容

Thank you for ______ me!

A. helping
B. to help
C. helped
D. clicking

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Granny often tells us ______ water in our daily life.

A. save
B. saving
C. to save
D. saves

I think _____ difficult for us to learn a foreign language well in a short time.

A. that
B. this
C. one
D. it

一维谐振子的能级是均匀分布的。（）

A. 对
B. 错

热拌沥青混合料复压时，一般碾压（）遍。

A. 1-2
B. 2-3
C. 3-4
D. 4-6