单项选择题
23（）
A．and
B．/
C．which
D．they
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相关考题
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单项选择题
21（）
A．demand
B．ask
C．press
D．seek -
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 cells have a shape with six sides -
单项选择题
The ideal title for this passage is （）
A．The Eel
B．Torpedo
C．Electric Fish
D．Electric Power
