单项选择题

The writer seems to suggest that if you don't know much about first aid, you should ______.

A．call for help from professionals
B．still try to help
C．stand by and not try to help
D．learn it from a doctor
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单项选择题
One day, more than 10,000 years ago, a woman ______.
A．found wheat
B．planted fruit trees
C．let fall some grass seeds
D．grew vegetables
单项选择题
From the passage, it can be concluded that women ______.
A．started civilization
B．knew what civilization was
C．helped a lot to start civilization
D．understood how important civilization was
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