单项选择题


A．indifferent
B．difficult
C．impossible
D．possible
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单项选择题
A．increaseB．causeC．reduceD．raise
A．increase
B．cause
C．reduce
D．raise
单项选择题
A．unwantedB．differentC．badD．desirable
A．unwanted
B．different
C．bad
D．desirable
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