单项选择题

From the second paragraph we know that high waves striking the shore are （）.

A．gradually reduced
B．difficult to predict
C．still very powerful
D．sometimes quite weak

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单项选择题
If you try to pass （） the problems, it would be impossible for you to make any progress in this field.

A．off
B．over
C．by
D．across
单项选择题
Once he set his mind to（）something, he would not give up easily.

A．do
B．doing
C．be doing
D．having done
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