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
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
Before the invention of agriculture, men went out ______.
A．to collect animals
B．to find animals
C．to hunt animals
D．to kill animals
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