单项选择题

A．Why species don’t avoid extinction by adapting.
B．Why species become extinct at the rate they do.
C．Why humans aren’t extinct.
D．How many species aren’t extinct.
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单项选择题
A．He enjoyed using it. B．He left it in the taxi. C．He left it at the airport. D．He lost it on his trip.
A．He enjoyed using it.
B．He left it in the taxi.
C．He left it at the airport.
D．He lost it on his trip.
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