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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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
单项选择题
Men believe that they are better and cleverer than women because ______.
A．they invent things
B．they do their work well
C．they change history
D．they run machines
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