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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Giraffes have (eyes) that allow them (seeing) in all directions without (twisting) their (heads).
A. eyes
B. seeing
C. twisting
D. heads
单项选择题
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
D. affected
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