1991年全国硕士研究生入学考试英语试题及答案

rom it. Since carbon dioxide is present in the air only in trace quantities (3 to 4 parts in 1O ,000 parts of air) and water vapor is near saturation in the air spaces within the leaf (at 80"F , saturated air would contain about 186 parts of water vapor in 1O, OOO parts of air) , the total amount of water vapor lost is many times the carbon dioxide intake. Actually, because of wind and other factors, the loss of water In proportion to carbon dioxide intake may be even greater than the relative concentrations of the two gases. Also, not all of the carbon dioxide that enters the leaf is synthesized into carbo- hydrates (碳水化合物) .

　　41 . A growing plant needs water for all of the following except__.

　　A. forming sugars 　　B. sustaining woody stems

　　C. keeping green 　　　D. producing carbon dioxide

　　42 . The essential function of photosynthesis in terms of plant needs is__.

　　A. to form sugars　　 　B. to derive energy from light

　　C. to preserve water 　　D. to combine carbon dioxide with water

　　43 . The second paragraph uses facts to develop the essential idea that__.

　　A. a plant efficiently utilizes most 0f the water it absorbs

　　B. carbon dioxide is the essential substance needed for plant development

　　C. a plant needs more water than is found in its composition

　　D. the stronger the wind, the more the water vapor loss

　　44 . According to the passage, which of the following statements is TRUE?

　　A. The mineral eLements will not be absorbed by the plant unless they are dissolved in its root .

　　B. The woody stems contain more water than the leaves.

　　C. Air existing around the leaf is found to be saturated.

　　D. Only part of the carbon dioxide in the plants is synthesized.

　　45 . This passage is mainly about__.

　　A. the functions of carbon dioxide and water

　　B. the role of water in a growing plant

　　C. the process of simple sugar formation

　　D. the synthesis of water with carbon dioxide 转贴于：博学在线_考研

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　　Ⅲ. For each numbered blank in the following passage there are four choices labelled A, B, C and D. Choose the best one and put your chnice in the ANSWER SHEET. (15 point)

　　When television first began to expand, very few of the people who had become famous as ra- dio commentators were able to be equally effective on television. Some of the difficulties they ex- perienced when they were trying to _46___ themselves to the new medium were technical. When working _47_ radio, for example, they had become _48____ to seeing on behalf of the listener. This _49_ of seeing for others means that the commentator has to be very good at talking. _50_ all, he has to be able to _51____ a continuous sequence of visual images which _52_ meaning -to the sounds which the listener hears. In the _53_ of television,however,the commentator sees everything with the viewer. His role, therefore, is _54_____ different. He is there to make _ 55_ that the viewer does not miss some point of interest, to help him _56_ on particular -things, and to _57____ the images on the television screen._58_ his radio colleague,he must know the _59_ of silence and how to use it at those moments _60_ the pictures speak for themselves .

　　46. A. turn 　　B. adapt 　　C. alter 　　D. modify

　　47. A. on 　　B. at 　　C. with 　　D. behind

　　48 . A. experienced 　　B. deTermined 　　C. established　　 D. accustomed

　　49. A. efficiency　　 B. technology 　　C. art　　 D. performance

　　50. A. Of 　　B. For 　　C. Above 　　D. In

　　51. A. inspire 　　B. create 　　C. cause 　　D. perceive

　　52. A. add 　　B. apply 　　C. affect 　　D. reflect

　　53. A. occasion 　　B. event　　 C. fact　　 D. case

　　54. A. equally　　 B. oompletely 　　C. initially 　　D. hardly

　　55. A. definite 　　B. possible 　　C. sure 　　D. clear

　　56. A. focus 　　B. attend　　 C. follow 　　D. insist

　　57. A. exhibit 　　B. demonstrate　　 C. expose 　　D. interpret

　　58. A. Like 　　B. Unlike　　 C. As 　　D. For .

　　59. A. purpose 　　B. goal 　　C. value 　　D. intention

　　60. A. if 　　B. when 　　C. which　　 D. as

　　Ⅳ. Each of the following sentences has four underlined parts. These parts are labelled A, B , C and D. Identify the part of sentence that is incorrect and put ynur choice in the ANSWER SHEET. Then , without altering the meaning nf the sentence , write down yom cnrrection on the line in the ANSWER SHEET. ( 1O point)

　　61 . These is aA delicate balance of nature whichB many square miles of ocean and vegetation and clean air are neededC to maintain only a relativelyD few human beings.

　　62 . The idea thatA learning is aB lifelong process has expressedC by philosophers and educationalists throughoutD the centuries.

　　63. Nobody besideA littleB children thinksC that a trip by bus is excitingD.

　　64 . Just outsideA the ruins areB a magnificentC building surroundedD by tall trees.

　　65 . In the teaching ofA mathematics, the way of instructi