单项选择题

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

A．regularly
B．rarely
C．always
D．predictably
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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
单项选择题
The most important thing in providing first aid is to ______.
A．call for an ambulance
B．prevent bleeding
C．know what to do
D．act quickly
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