单选题
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
【正确答案】
B
【答案解析】
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