单项选择题

From the second paragraph of the passage we know that the power of very high waves striking the shore is ______.

A．constant
B．equalized
C．variable
D．perpetual
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单项选择题
According to the passage, destruction caused by high waves occurs ______.
A．regularly
B．rarely
C．always
D．predictably
单项选择题
We know from this passage that out at sea, when waves going in opposite directions meet, their force ______.
A．cause great damage
B．extends to the ocean floor
C．is liable to lessen
D．increase rapidly
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