单项选择题

Fresh air,enough exercise and nutritious food ______ to good health.

A．contribute
B．add
C．attribute
D．distribute
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单项选择题
Rising prices may ______ the rise in demand for these goods.
A．reflect
B．remind
C．convey
D．explain
单项选择题
It is true that ____ drinking is bad for the health .
A．sufficient
B．little
C．enough
D．excessive
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