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【单选题】The idea of a fish being able to generate electricity strong enough to light lamp bulbs--or even to run a small electricmotor-is almost unbelievable, but several kinds of fish are able to do this. Eve...
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
【单选题】鱼类的发电器官大都是由( )转化而来的，如( )，个别的是由( )转化而来的，如( )。
A.
肌肉/电鳗、真皮腺/电鲶
B.
真皮腺/电鳗、肌肉/电鲶
C.
肌肉/电鲶、真皮腺/电鳗
D.
真皮腺/电鲶、肌肉/电鳗
【单选题】The idea of a fish being able to generate electricity strong enough to light lamp bulbs--or even to run a small electric motor--is almost unbelievable, but several kinds of fish are able to do this. E...
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