单项选择题

His original idea was good, but his _______ of the scheme was disastrous.

A．excursion
B．expedition
C．execution
D．exposition
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单项选择题
Obviously, the Chairman's remarks at the conference were _______ and not planned.
A．simultaneous
B．supplementary
C．instantaneous
D．spontaneous
单项选择题
With few exceptions, evidence indicated that the quality of the air, water, land, and living re sources continued to _______.
A．aggravate
B．deteriorate
C．decay
D．impair
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