单项选择题

National forests make money for the government through the sale of trees for lumber.

A．earn
B．print
C．trade
D．borrow
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单项选择题
To solve the problem of dry mouths, one is advised to take cool milk.
A． Right
B． Wrong
C． Not mentioned
单项选择题
The first paragraph mentions three ways of activating the saliva in the mouth.
A． Right
B． Wrong
C． Not mentioned
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