题目内容
______ these questions may sound academic, answers to them could have profound economic and political significance.
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A body weighs ______ from the surface of the Earth.
______ is often the case with a new idea much preliminary activity and optimistic discussion produce no concrete proposals.
Angiosperms inhabit relatively diverse environments and may be found ______ higher plants can survive.
Twelve is to six ______ two is to one.
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