单项选择题

A．A space rocket can only be used once.
B．The pilot can fly a space plane just like an ordinary plane.
C．A space rocket travels much faster than a space plane.
D．Both A and B.
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单项选择题
Paragraph II ______.
A．answers an objection that some readers may raise to paragraph I
B．guards against the possibility that you have read in paragraph I
C．contradicts the idea of paragraph I
D．is more optimistic than paragraph I
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