单项选择题

A．By the work of biologists.
B．In the process of evolution.
C．Over millions of years.
D．Both A and B
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单项选择题
A．They design the dresses themselves.B．They alter the dresses they have.C．They buy inexpensive clothes.D．They don’t mind the fashion in clothes.
A．They design the dresses themselves.
B．They alter the dresses they have.
C．They buy inexpensive clothes.
D．They don’t mind the fashion in clothes.
填空题
According to the passage, what problems are brought about by the automobile
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