题目内容

______to space travelers is high acceleration or deceleration forces.

A. That can be dangerous
B. What can be dangerous
C. They can be dangerous
D. It can be dangerous

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A. Where ballads how
Ballads were how they
C. How ballads that were
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B. It was dawned on Joseph
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The mountain was______ many animals, such as wolves, foxes and rabits once haunted but now it is so silent.

A. that place
B. where
C. what
D. then