練習(xí)

　　1.人類應(yīng)該為整個(gè)環(huán)境問題負(fù)責(zé)，包括全球變暖和臭氧層大大減少的問題。

　　2.二氧化碳與水結(jié)合后，酸性更大，可能對(duì)海洋生物造成傷害。

　　3.按照當(dāng)前的增長(zhǎng)率，到2050年二氧化碳的濃度(concentration)將達(dá)到550ppm，因而將增高全球溫度大約4℃。

　　4.空氣污染不僅對(duì)人體有害，而且影響環(huán)境，例如，它腐蝕建筑物、破壞莊稼和森林，甚至導(dǎo)致空氣能見度低而發(fā)生交通事故。

　　5.這個(gè)方案將集中力量控制酸雨污染、空氣污染、水污染，并采取綜合處理措施。

　　6.近年來，中國(guó)汽車總量劇增，大量排放有害氣體，成為危害國(guó)人身心健康的“無形殺手”。

　　7.據(jù)官方分析城市大氣污染70%以上來自汽車尾氣排放。

　　8.汽車尾氣污染的問題已引起政府和民眾的高度重視，一系列治理措施正在逐步有效地展開。

　　9.科學(xué)家在地球的每一個(gè)角落——從大城市到遙遠(yuǎn)的南極，都發(fā)現(xiàn)有污染的跡象。

　　10.最保守的估計(jì)是，氣溫將在本世紀(jì)上升2至3度，造成大量問題，耗費(fèi)總值50000億美元。

　　答案

　　1.Humans should be responsible for environmental problems, ranging from global warming to ozone depletion.

　　2.Mixing carbon dioxide into water makes it more acidic, which potentially could harm marine organisms.

　　3.At current rates of increase, the carbon dioxide concentration will reach 550ppm by the year 2050 and will raise the global "thermostat" by about 4 degrees centigrade.

　　4.Au pollution is not only harmful to people but also detrimental to our surroundings. For instance, it corrodes our buildings, damages crops and forests and causes traffic accidents because of poor visibility.

　　5.This program will concentrate on the control of acid rain pollution, air pollution and water pollution and require comprehensive measures.

　　6.Over the past few years, the drastic increase of motor vehicles in China has created a large amount of exhaust pollution, forming an "invisible Killer" menacing the physical and mental health of the general public.

　　7.The official analysis indicates that over 70 percent of air pollution in urban areas comes from vehicle emissions.

　　8.Pollution caused by vehicles exhaust has attracted high attention of both the general public and the government. A series of improvement measures have been put into effect.

　　9.Scientists have founded evidence of pollution everywhere on Earth, from the largest cities to the remote and isolate South Pole.

　　10.The most conservative estimates are that the temperatures will rise by 2-3℃ in this century, causing considerable problems, at a total cost of US$ 5,000 billion.

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