单项选择题

A．The difficulty of breeding electric fish.
B．The medical importance of electric fish.
C．How certain fish use electricity.
D．How fish navigate.
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单项选择题
A．She attended one of its meetings. B．Her roommate was one of its members. C．She saw its members protesting. D．She read about it in the newspaper.
A．She attended one of its meetings.
B．Her roommate was one of its members.
C．She saw its members protesting.
D．She read about it in the newspaper.
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