单项选择题

A．How animals survive harsh conditions in the wild.
B．How animals alter colors to match the surroundings.
C．How animals protect themselves against predators.
D．How animals learn to disguise themselves effectively.
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单项选择题
A．He went to see the doctor. B．He worked at a restaurant. C．He sang in a concert. D．He danced in a party.
A．He went to see the doctor.
B．He worked at a restaurant.
C．He sang in a concert.
D．He danced in a party.
单项选择题
A．He asked for leave yesterday. B．He has forgotten about it. C．He didn’t receive the memo. D．He lost his inbox.
A．He asked for leave yesterday.
B．He has forgotten about it.
C．He didn’t receive the memo.
D．He lost his inbox.
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