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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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
单项选择题
Which of the following is TRUE according to the passage
A．One should not apply first aid to the injured without knowing the ease of the accident.
B．It is easy to carry out first aid if one has the necessary facilities.
C．First aid is an important part of the whole treatment.
D．First aid may not be effective before a doctor or expert comes.
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