练习

　　1.人类应该为整个环境问题负责，包括全球变暖和臭氧层大大减少的问题。

　　2.二氧化碳与水结合后，酸性更大，可能对海洋生物造成伤害。

　　3.按照当前的增长率，到2050年二氧化碳的浓度(concentration)将达到550ppm，因而将增高全球温度大约4℃。

　　4.空气污染不仅对人体有害，而且影响环境，例如，它腐蚀建筑物、破坏庄稼和森林，甚至导致空气能见度低而发生交通事故。

　　5.这个方案将集中力量控制酸雨污染、空气污染、水污染，并采取综合处理措施。

　　6.近年来，中国汽车总量剧增，大量排放有害气体，成为危害国人身心健康的“无形杀手”。

　　7.据官方分析城市大气污染70%以上来自汽车尾气排放。

　　8.汽车尾气污染的问题已引起政府和民众的高度重视，一系列治理措施正在逐步有效地展开。

　　9.科学家在地球的每一个角落——从大城市到遥远的南极，都发现有污染的迹象。

　　10.最保守的估计是，气温将在本世纪上升2至3度，造成大量问题，耗费总值50000亿美元。

　　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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