单项选择题

Staying happy and enjoying life appear to be the key to （）healthy in old age.

A.staying
B.stay
C.being stayed
D.have stayed

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It is reported that when you lie down to sleep at night，the increase in body （）does occur （出现）.

A.appear
B.height
C.capital
D.island

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We saw （）elephant in the zoo.（）elephant was from India.

A.a，The
B.the，An
C.an，The
D.the，A