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.
Experts worry about airborne toxins that are emitted during some manufacturing processes because
选项 A、companies release millions of pounds of chemical wastes into the air each year.
B、the effects of many of these substances are unknown.
C、some airborne toxins are known to be cancer causers.
D、microscopic particulates in the air are responsible for 150,000 deaths each year.
答案C
解析 该题目问及专家担心空气中毒素的原因。此段提到毒素是在某些生产过程中释放出来的，大大小小的公司每年向空气中排放几百万磅化学废物。虽然许多毒素的影响还不为人知，但是其中的一些可以导致癌症。这些年备受关注的就是空气中的一些微粒有可能是导致每年超过十五万人死亡的原因。综合四个选项，C项表述与此相符；A、B项所述内容原文虽有提及，但不是原因；D项内容与原文有偏差，原文是may be responsible而不是are responsible，所以，确定C项为正确选项，排除其他三项。
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