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1、Unit 4 Global warming课时跟踪练（一）Warming Up & Reading-Pre reading.阅读理解AYou might think that “global warming” means nothing more than a rise in the worlds temperature. But rising sea levels caused by it have resulted in the first evacuation (撤离) of an island nation the citizens of Tuvalu will have to lea
2、ve their homeland.During the 20th century, the sea level rose 812 inches. As a result, Tuvalu has experienced lowland flooding of salt water that has polluted the countrys drinking water.Paani Laupepa, a Tuvaluan government official, reported to the Earth Policy Institute that the nation has suffere
3、d an unusually high number of fierce storms in the past ten years. Many scientists connect higher surface water temperatures resulting from global warming to greater and more damaging storms.Laupepa expressed dissatisfaction with the United States for refusing to sign the Kyoto Protocol, an internat
4、ional agreement calling for industrialized nations to reduce their greenhouse gas emissions (导致温室效应的气体排放), which are a main cause of global warming. “By refusing to sign the agreement, the US has effectively taken away the freedom of future generations of Tuvaluans to live where their forefathers ha
5、ve lived for thousands of years.” Laupepa told the BBC.Tuvalu has asked Australia and New Zealand to allow the gradual move of its people to both countries.Tuvalu is not the only country that is vulnerable (易受影响的) to rising sea levels. Maumoon Gayoon, president of the Maldives, told the United Natio
6、ns that global warming has made his country of 311,000 an “endangered nation”1The text is mainly about _.Arapid changes in earths temperatureBbad effects of global warmingCmoving of a country to a new placeDreasons for lowland flooding解析：选B主旨大意题。这篇短文主要讲述了全球变暖造成的恶劣影响，故答案选B。A、C、D三项都是细节。2According to s
7、cientists, the DIRECT cause of more and fiercer storms is _.Agreenhouse gas emissions in industrialized nationsBhigher surface water temperatures of the seaCcontinuous global warmingDrising sea levels解析：选B细节理解题。根据第三段中“Many scientists connect higher surface water temperatures resulting from global wa
8、rming to greater and more damaging storms.”可判断出造成严重的暴风雨的直接原因是海洋表面水温太高。3Laupepa was not satisfied with the United States because it did not _.Aagree to reduce its greenhouse gas emissionsBsign an agreement with TuvaluCallow Tuvaluans to move to the USDbelieve the problems facing Tuvalu were real解析：选A
9、细节理解题。第四段第一句话表示Laupepa对美国不满意的原因是美国拒绝签署号召工业化国家减少温室效应气体排放的国际性公约。4The country whose situation is similar to that of Tuvalu is _.AAustraliaBNew ZealandCthe Maldives Dthe United States解析：选C细节理解题。根据最后一段可判断出the Maldives与Tuvalu的情况相似。BIn the atmosphere, carbon dioxide allows the suns rays to enter but preven
10、ts the heat from escaping. According to a weather experts prediction, the atmosphere will be warmer in the year 2050 than it is today, if man continues to burn fuel at the present rate. If this warming up took place, the ice caps in the poles would begin to melt, thus raising sea level several meter
11、s and severely flooding coastal cities. Also, the increase in atmospheric temperature would lead to great changes in the climate of the northern hemisphere.In the past, concern about a manmade warming of the earth has concentrated on the Arctic because the Antarctic is much colder and has a much thi
12、cker ice sheet. But the weather experts are now paying more attention to West Antarctic, which may be affected by only a few degrees of warming, in other words, by a warming on the scale that will possibly take place in the next fifty years from the burning of fuels. Satellite pictures show that lar
13、ge areas of Antarctic ice are already disappearing. The evidence suggests that a warming has taken place. This fits the theory that carbon dioxide warms the earth.However, most of the fuel is burnt in the northern part of the earth, where temperatures seem to be falling. Scientists conclude, therefo
14、re, that up to now natural influences on the weather have exceeded those caused by man. The question is: Which natural cause has the most effect on the weather?One possibility is the behavior of the sun. Astronomers at one research station have studied the hot spots and “cold” spots, that is, the re
15、latively less hot spots, on the sun. This seems to have a greater effect on the distribution of the earths atmospheric pressure, and consequently on wind circulation (循环). The sun is also variable (可变的) over a long term. Its heat output (输出) goes up and down in cycles. The latest trend being downwar
16、d is on the way. But that is only an imagination.5The carbon dioxide in the atmosphere would _.Aprevent the suns rays from reaching the earths surfaceBmean a warming up in the ArcticCaccount for great changes in the climateDraise the temperature of the earths surface解析：选D细节理解题。文章第一段讲到二氧化碳在大气中吸收太阳的光线并阻挡光热的流失，文章第二段最后一句话又再次提到二氧
