![](https://cos-cdn.shuashuati.com/pipixue-wap/2020-1230-1107-56/ti_inject-812ce.png)
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