单项选择题

While offering first aid, the helper should ______.

A．be self-controlled
B．have others to assist him
C．have confidence in the sick person
D．get rid of the by-standers
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单项选择题
According to the passage, some injured or sick people died as a result of ______.
A．other people's hesitation to offer first aid
B．unprofessional first aid
C．unnecessary first aid
D．unwise suggestion by by-standers
单项选择题
If only I ______ how to operate a computer!
A．learn
B．would learn
C．have learned
D．had learned
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