单项选择题

A．Baseball.
B．Basketball.
C．Volleyball.
D．Football.
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单项选择题
A．Because terms such as environmentally friendly and non-polluting cannot be verified.B．Because terms such as environmentally friendly and non-polluting are often wrongly used.C．Because terms such as environmentally friendly and non-polluting are used too widely.D．Because terms such as environmentally friendly and non-polluting are groundless.
A．Because terms such as "environmentally friendly" and "non-polluting" cannot be verified.
B．Because terms such as "environmentally friendly" and "non-polluting" are often wrongly used.
C．Because terms such as "environmentally friendly" and "non-polluting" are used too widely.
D．Because terms such as "environmentally friendly" and "non-polluting" are groundless.
单项选择题
The main idea of the third paragraph is that______.
A．a mature torpedo is capable of producing enough electricity to knock down a man
B．the mass of the fish decides the intensity of electric power it generates
C．the strength of shock given by a young electric ray can only light the bulb of a pocket flashlight
D．to make full use of the energy produced by electric fish, suitable wires should be available
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