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大学英语练习题：
Television broadcasts are 71 to an area that is within the 72 of the sending station or its relay(中转站). 73 television relays are often placed on hills and mountains so that they can 74 a wider region, they still can not cover more [and than one from the hilltop 75 a clear day.However, the rays also go out into the atmosphere, 76 there is a relay station on a satellite that 77 around the earth, it can send the pictures to any point on the earth from which the satellite is 78 Three satellites 79 . turning around over the equator(赤道)send any television program to any part of the earth. 80 makes it possible for world 81of newspapers to give-the news in all countries at the same time. 82 it may be possible for a subscriber (订户)to a televised news-paper to 83 a button and see a newspaper page 84 his television screen. He could also decide when he wants the page 85 , 86 , by dialing different such as 87 on a telephone dial, he could choose the language or the edition of the paper he wants to read. It seems strange to think that, even today, methods of the 88 are not entirely useless. For example, sometimes89agencies which use radio and Telstar also use pigeons to 90 messages between offices in large cities because the pigeons are not bothered by traffic problems.
71. A. prohibited B. bounded C. limited D. shifted72. A. range B. view C. miles D. distance73. A. Even B. Although C. UnlessD. Whenever74. A. cover B. spread C. help D. pass75. A. in B. during C. on D. at76. A. and then B. by far C. when D. and if77. A. spins B. revolves C. jumps D. circles78. A. watched B. visible C. spotted D. protected79. A. always B. temporarily C. permanently D. periodically80. A. This B. That C. What D. Which81. A. population B. editions C. articles D. reports82. A. The other day B. At the future C. Someday D. One day83. A. touch B. press C. suppress D. thumb84. A. at B. in C. onD. by85. A. turn B. to turn C. turning D. to be turned86. A. also B. moreover C. andD. then87. A. what B. these C. those D. ones88. A. passed B. past C. old days D. out-of-date89. A. press B. conference C. newspapersD. books90. A. bring B. take C. distribute D. send
大学英语练习题答案：
71.C limit：限制，局限。电视台的位置是受到局限的。prohibit：vt.禁止。bound：vi.跳跃，跳动。shift：vt.转移，移动。72.A range射程，有效距离，量程。如：We waited until the enemy was within range，我们等敌人进入了射程。本文指中转站能发射到的距离范围之内。73.B根据上下文的逻辑关系，需要一个转折关系的连词。本句含义为：为了发射的范围更广一些，虽然电视中转站经常设在高山上，可是却远不如设在山顶上发射的范围广。74.A cover：vt.覆盖。spread：vt.传播;help：vt.帮助;pass：vt.通过。此处指中转站覆盖的地区。75.C通常说on a clear day.强调具体的时间时用介词on.如：on Friday，on the evening when l was busy.76.D根据上下文的逻辑关系，此处要用表示条件的句子，加上与前面的句子是并列关系，所以选D.77.B revolve around：绕转，公转(主要指星球，球体)，此处指卫星绕着地球转动。spin：vi.旋转(以……为轴)。the top was spinning merrily.陀螺在轻快地旋转着。jump：vi.跳跃。circle：v.使转圈，在……上方盘旋。78.B visible能看得见的，是形容词。其余的都是动词，放在这里是被动语态，不符合语法。79.C permanently：adv.永久地，永恒地。al-ways：adv.总是。temporarily：adv.临时地，暂时地;periodically：adv.周期性地，定期地。卫星应该被永久固定在一处进行节目的转播。80.A根据文意，此处要表达的意思是“这使得世界范围内发行的报纸能够同时向全世界发送新闻。”指示代词this和that可指代前文的句子或句子中的一部分。This指代距离较近的内容。因此A项最合适。81.B edition：版本;这里指报纸的出版。popuIation：n.人口;articles：n.文章;reports：n.报道。此三项均不符合题意。82.C someday：表示将来的某一天。the other day：前一天。on day：有一天。future：n.将来。未来。一般用in the future.因此C项正确。83.B press a button：按动电扭，最符合题意。touch：触摸，接触，主要强调触觉，一般不和button搭配。suppress：镇压。thumb：用拇指翻动。84.C on the television screen 在电视屏幕上。85.B 当不定式修饰want，have等动词的宾语、而整个句子的主语是不定式的逻辑主语时，不定式用主动形式表示被修饰宾语的被动含义：We have little homework to do.(我们没有多少作业可做。即：没有多少作业可以被做。)(实际上是we do homework，所以用主动语态);She felt tired because she has three babies to look after.(她要照看三个孩子，所以很累。)(实际上是she looks after the habies，所以用主动语态。)86.C 前面有he could…，后面又有he could…明显是两个并列句，所以选and.87.C为了避免重复，可用that，those代替前面提到过的名词。但this，these没有这种用法。88.B methods of past：过去的方法。89.A press agency：新闻机构。
90.D send message：发送信息。
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