单项选择题

It can be seen from the passage that________.

A．the capacity to generate electricity is the distinctive characteristic of the fish
B．the current travels in an upward direction from the positive side to negative side in torpedo' s electric cells
C．some fish can produce enough electricity to drive a number of electric motors
D．the torpedo's electric ceils have a shape with six sides
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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
单项选择题
The reason why the electric eel is able to give more powerful shock is that________.
A．the working system of the electric plates in the eel is the most effective
B．the working system of the electric plates in the eel is far inferior to those in the torpedo
C．compared with those in the torpedo, the working system of electric plates in the eel is more direct and efficient
D．compared with other electric fish, the eel possesses much more electric plates
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