题目内容
______ to space travelers is high acceleration or deceleration forces.
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______ these questions may sound academic, answers to them could have profound economic and political significance.
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.
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