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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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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The most important thing in providing first aid is to ______.
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B．prevent bleeding
C．know what to do
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