certain muscle cells have become so specialized as electrical generators that they do not work as muscle cells at all.When large numbers of these cells are linked together,the effects can be astonishing. The electric eel is an amazing storage battery.It can send a volt of as much as eight hundred volts of electricity through the water in which it lives (An electric house current is only one hundred twenty volts).As many as four-fifths of all the cells in the electric eel's body are specialized for generating electricity.and the strength of the shock it can deliver corresponds roughly to the length of its body. 11.What is the main idea ofthe passage? A)Electricity is dangerous. B)Biology and electricity appear to be closely related C)People would be at a loss without electricity D)Scientists still have much to discover about electricity. 12.How many volts ofelectricity can an electric eel send out A)1,000B)800C200 D)120 13.The word"grope"in line 3 is closest in meaning to which of the following? A)Search blindly.B)Wander aimlessly.C)Wave one's hands.D)Complain eagerly 14.Why does the author mention electriceels? A)To warn the reader to stay away from them B)To compare their voltage to that used in housed. C)To givean example generator.D)To describe a new source of electrical power 15.It can be inferred from the passage that the longer an eel is the A)more beneficial it will be to science B)more powerful will be its electrical charge C)easier it will be to find D)tougher it will be to eat PartI Vocabulary and Structure (10 points) Directions:There are 20 incomplete sentences in this part.For each sentence there are four choices marked A),B),C)and D).Choose the ONE that best completes the sentence.Then mark the corresponding letter on the Answer Sheet with a single line through the center 1.Scientists will have to come up ()new methods of increasing the world's food supply A.to B.with C.against D.for 2.The decision().the next problem was how to make a good plan A.having made B.having been made C.has been made D.having been making 3.We take this opportunity of expressing our sincere ()of your help A.competition B.attention C.concentration D.appreciation 17 certain muscle cells have become so specialized as electrical generators that they do not work as muscle cells at all. When large numbers of these cells are linked together, the effects can be astonishing. The electric eel is an amazing storage battery. It can send a volt of as much as eight hundred volts of electricity through the water in which it lives (An electric house current is only one hundred twenty volts).As many as four-fifths of all the cells in the electric eel's body are specialized for generating electricity, and the strength of the shock it can deliver corresponds roughly to the length of its body. 11.What is the main idea of the passage? A) Electricity is dangerous. B) Biology and electricity appear to be closely related. C) People would be at a loss without electricity D) Scientists still have much to discover about electricity. 12.How many volts of electricity can an electric eel send out? A) 1,000 B)800 C)200 D)120 13.The word “grope” in line 3 is closest in meaning to which of the following? A) Search blindly. B)Wander aimlessly. C)Wave one's hands. D)Complain eagerly. 14.Why does the author mention electric eels? A) To warn the reader to stay away from them B) To compare their voltage to that used in housed. C) To give an example of living electrical generator. D)To describe a new source of electrical power. 15.It can be inferred from the passage that the longer an eel is the _____. A) more beneficial it will be to science B) more powerful will be its electrical charge C) easier it will be to find D)tougher it will be to eat PartⅢ Vocabulary and Structure (10 points) Directions: There are 20 incomplete sentences in this part. For each sentence there are four choices marked A),B),C) and D). Choose the ONE that best completes the sentence. Then mark the corresponding letter on the Answer Sheet with a single line through the center. 1.Scientists will have to come up ( ) new methods of increasing the world’s food supply. A. to B. with C. against D. for 2.The decision( ),the next problem was how to make a good plan. A. having made B. having been made C. has been made D. having been making 3.We take this opportunity of expressing our sincere ( ) of your help. A. competition B. attention C. concentration D. appreciation