单项选择题

A．infertile
B．fertile
C．infertility
D．fertility
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单项选择题
A．atB．byC．inD．around
A．at
B．by
C．in
D．around
单项选择题
How does the man know so much about San Francisco
A．He think the city is pretty.
B．He likes to talk about it.
C．He travels a lot in the city.
D．He teaches ethnic history at a university.
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