★沈阳四六级模拟试题.docVIP

沈阳四六级模拟试题 Part Two Proof-reading Exercises Passage 34 The concern of some environmental scientists that the increasing level of carbon dioxide in the earth’s atmosphere will raise global temperatures until the mid-latitudinal regions become steaming jungles are open to question. Contending scientists [1]_______ are correct that the concentrating of carbon [2]_______ dioxide, due to automobile exhaust, for example, is increasing. Through the absorption and re- radiation of infrared radiation, carbon dioxide does warmer the atmosphere. Unfortunately, indirect [3]_______ effects that these scientists have not considered may occur. If global temperature increased as a result of high carbon dioxide levels, evaporation of [4]_______ water from the lakes and oceans will also occur. [5]_______ Upon reaching the lower limit of condensation, cumulonimbus clouds would form. Water vapor is transparent to visible wavelengths of the electromagnetical spectrum; however, Lamb [6]______ estimates that cumulonimbus clouds scatter seventy percent of the earth incident solar [7]______ radiation. With a reduction of solar radiation reaching the earth’s surface, cooling would occur, first on land, second in the atmosphere. Other [8] _______ indirect effect of higher global temperatures that some environmental scientists have considered is [9] _______ that a great amount of heat would be absorbed from the atmosphere prior to the melting of polar ice packs and continental glaciers. The amount of heat energy that ice would absorb prior to melting is known as “the heat of fusion.” The atmosphere would lose a significant great amount of heat [10]_______ energy in the process of melting the world’s natural ice reserves. Passage 35 Before investing in common stocks, one should be aware of both their advantages and disadvantages. One advan