CLOZE
　　American teenagers have always
　　worked for extra pocket money. More
　　than their predecessors, today'swww.Ｅxamda.CoM考试就到考试大
　　adolescents are __51__ to work long 51. A) about B) fond
　　hours during the week for hundreds of C) likely D) possible
　　dollars each month. They spend the
　　money __52__ themselves rather than 52. A) by B) on
　　C) in D) for
　　__53__ it to their families. In a 1987 53. A) contributing B) contribute
　　C) paying D) pay
　　__54__ of 16,000 high school seniors 54. A) view B) inspection
　　C) observation D) survey
　　nationwide, it was __55__ that eighty 55. A) suggested B) found
　　percent of students who work spend C) recommended D) advised
　　their earnings on their own needs,
　　__56__ clothing, stereo equipment, 56. A) for example B) such as
　　C) that is to say
　　D) in other words
　　records and __57__. __58__ five 57. A) going to the movie
　　B) going to movies
　　C) movies D) the movie
　　percent said they contributed most 58. A) Other B) Only
　　of their income, which often exceeded C) Additional D) Further
　　??200 a month, to help pay family
　　living __59__ . 59. A) expenses B) money
　　The benefits of this work-and- C) values D) charges
　　spend ethic are being __60__ debated. 60. A) furiously B) heatedly
　　C) thoroughly D) entirely
　　__61__ experts, and many parents, 61. A) No B) All
　　C) Any D) Some
　　__62__ that year-round part-time 62. A) insist B) demand
　　employment increases youngsters' sense C) suggest D) require
　　of worth, teaches them financial__63__ 63. A) accounts B) ability
　　C) responsibility D) well-being
　　and reduces tension -- and thus __64__ 64. A) crash B) conflict
　　-- within the family. C) battle D) struggle
　　Others, __65__, argue that working 65. A) furthermore B) therefore
　　teenagers are inappropriately separat- C) however D) besides
　　ed, physically and financially, __66__ 66. A) in B) with
　　C) from D) by
　　their families, which __67__ parental 67. A) weakens B) loses
　　authority. C) reduces D) destroys
　　Teenagers' schoolwork can also
　　__68__. "When youngsters work for 68. A) be suffered B) suffer
　　C) be suffered from
　　D) suffer from
　　luxuries, they are buying __69__ 69. A) destruction B) separation
　　from education," said a program C) affection D) distraction
　　director for the U.S. Department of
　　Education. Working teenagers them-
　　selves say they have __70__ time to 70. A) more B) less
　　spend with friends and family. C) reduced D) sufficient
　　READING COMPREHENSION
　　Questions 71 to 75 are based on the following passage:
　　It was very late before Guglielmo followed his brother up to bed, foran extraordinary idea had come to him. If a spark could cause ether wavesto travel to another machine across a room and make that machine spark,why couldn't a bigger spark make waves travel a longer distance and causeanother spark, say, a mile away? And, by using long and short sparks, whycouldn't this be used to send messages by Morse Code? Indeed, why shouldn'tmessages be sent this way over great distances, using the ether instead ofwires?
　　The elder man found his young brother poor company during the rest ofthat holiday, for Guglielmo was so interested in his idea that he couldnot take his thoughts off it.
　　At last they arrived home at their father's mansion outside Bjologna,and young Marconi hurried to his laboratory to start his experiments.Assisted by his brother Alfonso, who, although nine years his senior, was not ashamed to work under this brilliant young scientist, he struggled formonths testing his idea. At last, to their joy, they got the instrument atthe other end of the room to give its answering spark.
　　Marconi now decided to show his father that there really was somethingin this idea of his, for Signor Marconi, who had made a large fortune inbusiness, had not a great deal of faith in his youngest son's science.
　　At last the apparatus was ready, and Guglielmo invited his father andmother to come to the laboratory.
　　Signor Marconi entered, his good-humoured face beaming."What is thisnew toy you have made, my boy?"he asked.
　　"Listen." the young inventor said, and he pressed a switch.
　　Faintly, in the lower part of the big house, an electric bell rang.
　　"Well?"his father inquired.
　　"There are no wires running to that bell. Don't you see what it means.Father? Messages can be sent through space without wires to carry them."
　　But Signor Marconi was not convinced."Let me take one of your machinesdown to the lawn. Then, if you can send me a signal, I'll believe you."he said.
　　Marconi took him at his word. A little later he was back in the lab, hishand on the morse key. Through the window he could see his father at thereceiver. The young man's heart thumped as he tapped ?- the test signal, S,which telegraphists use. He could tell by the expression on his father'sface that the message had got through.
　　That evening Signora Marconi talked to her husband and on the followingday Guglielmo was overjoyed to receive from his father 5,000 lire -- about??250 -- to help with his experiments.
　　71. According to Gaglielmo _______.
　　A) any spark could send ether waves to wherever it wanted
　　B) ether waves could be used to operate machines
　　C) messages could be sent by ether instead of wires
　　D) bigger sparks could travel a mile and send messages
　　72. In Guglielmo's opinion, the distance ether waves travel depends on
　　_______.
　　A) the force of a spark
　　B) the size of the room
　　C) the type of the machine
　　D) the way the machine is operated
　　73. Guglielmo was so taken up with the idea that _______.
　　A) he decided to put an end to his holiday
　　B) stayed up late wondering about it
　　C) he paid little attention to anything else
　　D) he didn't want to stay with his brother
　　74. His father didn't see the point of his invention till _______.
　　A) he heard the bell ring
　　B) he saw the apparatus
　　C) he listened to his son's explanation
　　D) he received the signal himself with the machine
　　75. What is implied in the passage?
　　A) Guglielmo was better than his brother in science.
　　B) His father was so fascinated by his invention that he proposed to join them.
　　C) Guglielmo discovered that a spark can make other waves travel.
　　D) Morse Code was invented by the Marconi brothers.