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听力原文： The World Bank says air pollution is one of the worst environmental problems in large cities around the world. Air pollution causes breathing problems. It also threatens crop production in farm areas near huge cities.
The United Nations Environment Program says that air pollution reduces the amount of crops produced, h also reduces the nutrient level of crops. As a result, both the buyer and the seller of crops are hurt by air pollution.
The UN says dirty air is a major source of metal in crops. These metals include lead, zinc and copper. These metals can build up to dangerously high levels in the parts of plants that people eat. The German Appropriate Technology Exchange, GATE, reports that eating these metals can cause developmental problems and low intelligence levels among children. Some kinds of cancers and kidney damage have also been linked to metals in crops.
Who is hurt by air pollution?

A.
B.
C.
Who
D.The
E.
B．The
F.
C．Both
G.
D．None.


【参考答案】

C
解析：从报道的“Asaresult，boththebuyerandthesellerofcropsarehu......

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Why people work? Undoubtedly you have periodically asked yourself the same question, perhaps focused on why you have to work. 'Self interest' in its broadest sense, including the interests of family and friends, is a basic motivation for work in all societies. But self-interest can involve more than providing for subsistence or accumulating wealth. For instance, among the Maori, a Polynesian people of the South Pacifica desire for approval, a sense of duty, a wish to conform. to custom and tradition, a feeling of emulation (竞争), and a pleasure in craftsmanship are additional reasons for working. Even within the United States, we cannot understand work as simply a response to economic necessity. Studies show that the vast majority of Americans would continue to work even if they inherited enough money to live comfort- ably.When people work, they gain a contributing place in society. The fact that what they receive pay for their work indicates that what they do is needed by other people and that what they are a necessary part of the social fabric. Work is also a major social mechanism for placing people in the larger social structure and for providing them with identities. In the United States, it is a blunt and ruthlessly public fact that to do nothing is to be nothing and to do little is to be little. Work is commonly seen as the measure of an individual.Sociologist Melvin L. Kohn and his associates have shown some of the ways work affects our lives. Generally, people who engage in self-directed work come to value self-direction more highly, to be more open to new ideas and to be less authoritarian in their relationships with others. Moreover, they develop self-conceptions consistent with these values, and as parents they pass these characteristics on to their children. Our work, then, is an important socializing experience that influences who and what we are.Traditionally, work for 'self interest' would be interpreted to mean work for______.
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