单项选择题

(Without) entering the body and (cause) damage, the CT is (far) superior (to) the X - ray or exploratory surgery.

A．Without
B．cause
C．far
D．to
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A．The
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Evidence (has been put forward) (showing) that astronauts (exposed) to long periods of weightlessness have (affected) quite severely.
A．has been put forward
B．showing
C．exposed
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