单项选择题

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

A．regularly
B．frequently
C．rarely
D．suddenly
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单项选择题
From the second paragraph we know that high waves striking the shore are ______.
A．gradually reduced
B．still very powerful
C．difficult to predict
D．sometimes quite weak
单项选择题
According to the passage, which of the following is TRUE
A．The deeper the sea, the stronger the waves.
B．The sea is always calm at a great depth.
C．Huge waves start from the depth of sea.
D．Shallow waters will not be affected by big waves.
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