单项选择题

Giraffes have (eyes) that allow them (seeing) in all directions without (twisting) their (heads).

A．eyes
B．seeing
C．twisting
D．heads
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I am (sorry) that (I have kept) you (waited) so (long).
A．sorry
B．I have kept
C．waited
D．long
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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