单选题：Some of the trials were probably stopped early for commercia

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题目内容：
Some of the trials were probably stopped early for commercial reasons. A．Right
B．Wrong
C．Not mentioned

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It seemed incredible that the baby saved his parents.

It seemed incredible that the baby saved his parents.A．offensive B．obvious C．unb

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According to the fifth paragraph, under what conditions are

According to the fifth paragraph, under what conditions are algae able to use so

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回答(54)题

回答(54)题A．concentrating B．detecting C．selecting D．harnessing

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