单项选择题

A．Because it was cheap.
B．Because it is in such good condition.
C．Because it is a collector’ s item.
D．Because he can re - sell it are high price.
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单项选择题
Usually you will not get a shock by touching the electric ray in one place only because______.
A．the current in one place is not strong enough to give a shock
B．the fish' s electric cells are filled with jelly-like substance
C．to complete the circuit, you have to touch the fish in two places
D．a torpedo' s electric cells contain more than one electric plates
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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