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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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
单项选择题
(The) climate (here) is often said (to be) similar to (one) of Japan.
A. The
B. here
C. to be
D. one
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