[A]down
[B]on
[C]off
[D]up

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• The most powerful electric fish produces enough electricity to______.
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  B．kill a marine animal
  C．drive a small electric motor
  D．kill a large fish

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• The electric plates on the electric eel______.
  A．run along the length of its body
  B．are found on sides of its head
  C．are located in its head
  D．are in its tail

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• The boy wanted to ride his bicycle in the street, but his mother told him _______.
  [A]not to
  [B]not to do
  [C]not do it
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• Usually you will not get a shock until you touch______.
  A．a torpedo in one place
  B．the water nearby it
  C．its main nerve connected with fine nerves
  D．a torpedo in two places

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• The purpose of the shock produced by electric fish is to______.
  A．protect themselves from being attacked
  B．light up nearby waters
  C．attack other fish or marine animals
  D．both A and C

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