单项选择题

Scientists have made a __________ in their combat against the AIDS.

A．breakup
B．breakdown
C．breakthrough
D．breakout
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单项选择题
The members of the club voted to __________ the constitution in order to enjoy more privilege.
A．assimilate
B．concede
C．amend
D．confer
单项选择题
The result of the experiments is reliable and persuasive as all the participants are chosen__________.
A．at random
B．at length
C．to excess
D．on average
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