单项选择题

To begin with, it is impossible to come up with a satisfactory definition of what constitutes happy and unhappy marriage.

A．explain
B．oppose
C．represent
D．propose
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单项选择题
Environmental officials insist that something be done to______acid rain.
A．curb
B．sue
C．detoxify
D．condemn
单项选择题
The best exercise should require continuous______, rather than frequent stops and starts.
A．compassion
B．acceleration
C．frustration
D．exertion
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