单项选择题

We know from this passage that out at sea, when waves going in opposite directions meet, their force （）.

A．causes greater damages
B．extends to the ocean floor
C．is likely to be weakened
D．increases quite rapidly

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单项选择题

It is obvious that the depth of the sea near the coast （）.

A．is the major factor influencing the strength of high waves
B．influences the strength of high waves only slightly
C．has influence only upon the strength of very high waves
D．doesn't have connection with the power of high waves

单项选择题

According to the passage, destruction caused by high waves occurs （）.

A．regularly
B．rarely
C．frequently
D．suddenly