2. 外语
  3. Read the following article about responsibility for the natural environment and the questions on the opposite page. For each

Read the following article about responsibility for the natural environment and the questions on the opposite page. For each

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问题     Read the following article about responsibility for the natural environment and the questions on the opposite page.
    For each question(15-20), mark one letter(A, B, C or D)on your Answer Sheet.
    The difficulty of balancing profits and social responsibility is very apparent when you consider environmental issues. Consumers value the goods and services that business produces, but businesses cannot produce goods and services without polluting to some degree. Businesses strive to lower their costs in order to offer products to consumers more efficiently and to make profits for investors, but sometimes it is necessary for businesses to spend more in order to pollute less. When such situations arise, whose interests should be served first—those of society, the consumer, or the investor? Clearly, this question has no easy answer, but examining how businesses pollute may provide some perspectives.
    Economic progress threatens our air, water, and land because these elements can so easily be tainted by pollution. Moreover, the pollution in any one element can easily taint the others. This problem is pervasive in industrialised and developing nations alike. In fact, the emerging economies of Asia and Latin America have built much of their growth on very loose environmental standards. But Mexico, Malaysia, and other countries are realising that their prosperity can be sustained only if their citizens can enjoy a quality of life that comes with a clean environment. At the same time, the countries of Eastern Europe are scrambling to reverse the decade of environmental neglect that occurred around the middle of the 20th century. As you can imagine, this is no easy task.
    The most noticeable form of air pollution, smog, is produced by the interaction of sunlight and hydrocarbons(gases released when fossil fuels are burned). We need only look at the smog that hangs over many major cities of the world to know that air pollution is a problem that businesses, consumers, and governments must address together. Another damaging air pollutant is acid rain, created when emissions from coal-burning factories and electric utility plants react with air. In addition, emissions from factories and cars pollute the air and contribute to global wanning through the greenhouse effect, in which heated gases form a layer of unusually warm air around the earth, trapping the sun’s heat and preventing the earth’s surface from cooling.
    Experts worry about airborne toxins that are emitted during some manufacturing processes. Large and small companies together release millions of pounds of chemical wastes into the air each year. Although the effects of many of these substances are unknown, some are known to be cancer causers. Of special concern in recent years are microscopic particulates in the air that may be responsible for more than 150, 000 deaths each year.
    Our air is not the only part of our environment to suffer. Water pollution has damaged many U. S. lakes, rivers, stream, harbours and coastal waters. This pollution comes from a variety of sources: manufacturing facilities, mining and construction sites, farms, and city sewage systems. The main threat is the careless day-to-day disposal of wastes from thousands of individual sources. Even if all wastewater were purified before being discharged, our groundwater would still be endangered by leakage from the millions of tons of hazardous substances that have been buried underground or dumped in improper storage sites. Much of this pollution was created years ago by companies that carelessly—but legally—disposed of substances now known to be unhealthy. Cleaning up these wastes is extremely difficult and expensive.
    In addition, companies and individuals generate enormous amounts of solid waste—over 200 million tons in the United States each year. Much of this waste ends up in landfills. A large part of the problem is consumer demands for convenience and fashion. These demands lead to creating disposable items, manufacturing products with excess packaging, and discarding useful items that are no longer the hot style or colour. Fortunately, recent efforts to conserve and recycle resources are helping to combat the land pollution problem.
What is greenhouse effect?
选项 A、It is produced by the interaction of sunlight and hydrocarbons.
B、It is created when emissions from coal-burning factories and electric utility plants react with air.
C、It is the gradual rise in temperature of the earth atmosphere which is caused by an increase of gases in the air trapping the heat of the sun.
D、It is produced by airborne toxins that are emitted during some manufacturing processes.
答案C
解析 第三段主要讲述空气污染。最显而易见的空气污染物——雾霾是燃烧矿物燃料时产生的碳氢化合物与阳光相互作用产生的。另一种空气污染物是酸雨，是由工厂燃烧煤炭以及发电厂的排放物与空气反应产生的。此外，工厂排放物以及汽车尾气也同样污染空气，并通过温室效应导致了全球变暖。题目要求解释温室效应，本段的最后一句话回答了该问题，工厂废气和汽车排放的尾气形成了热气层，吸收太阳的热，阻止地表变凉，由此可以确定C项为正确选项。
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