单项选择题

A．The oxygen level in the water.
B．The angle of the treadwheel.
C．The weights on the divers.
D．The temperature of the water.
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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.
A．The difficulty of breeding electric fish.
B．The medical importance of electric fish.
C．How certain fish use electricity.
D．How fish navigate.
单项选择题
A．She might be late for her chemistry class. B．She’ll borrow a bike after class. C．She might be delayed in the lab. D．She might ride her bike to the lab.
A．She might be late for her chemistry class.
B．She’ll borrow a bike after class.
C．She might be delayed in the lab.
D．She might ride her bike to the lab.
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