61．Which of the following call produce the strongest shock?
　　[A]The electric eel． 
　　[B]The electric catfish．
　　[C]The newly—born electric torpedoes． 
　　[D]The fully—grown electric ray．
　　62．Why are horses used to catch the electric eels?
　　[A]To frighten the eels． 
　　[B]To exhaust the eels．
　　[C]To attract the eels．
　　[D]To stir the water．
　　63．The electric catfish has a different electric system in that＿＿＿．
　　[A]current moves from the head to the tail 
　　[B]current moves from the tail to the head
　　[C]current moves from the left to the right
　　[D]current moves from the right to the left
　　64．Which of the following statements is not true?
　　[A]Electric fish come from different families．
　　[B]One can get a shock by touching the electric rays in two places．
　　[C]The electric plates in the rays are connected with the spinal cord．
　　[D]The electric catfish is edible．
　　65．The language of the passage is mostly＿＿＿．
　　[A]descriptive 
　　[B]narrative 
　　[C]expositive 
　　[D]critic