单项选择题

A．The man wasn’’t a US citizen.
B．The business company accepted the man.
C．The man could not present sufficient credentials.
D．The man was a very impressive person.
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单项选择题
If you have a feeling of lightheadedness, you’’ll need professional help.
A．Y
B．N
C．NG
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
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