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【单选题】

Some critics of tidal and wind energy argue that the power generation is intermittent and unreliable.

A.
the next stage of development
B.
the production of something
C.
all the people born around the same time
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参考解析:
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举一反三

【单选题】The engine will have an open center that will allow animals to swim through.

A.
building or place used for a particular purpose or activity
B.
middle area of an object
C.
moderate political position between two extremes