单项选择题

There is no risk to public health.

A．point
B．danger
C．chance
D．hope
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单项选择题
I don't quite follow what she is saying.
A．believe
B．understand
C．explain
D．accept
单项选择题
It took us a long time to mend the house.
A．build
B．destroy
C．design
D．repair
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