20. D　主旨大意题。狗咬人，尤其是狗咬小孩的现象比较严重，那么如何避免狗咬小孩呢？这才是本文的写作重点，而只有D项更能说明此问题，故正确答案选D项。

　　In his 1930 essay “Economic Possibilities for Our Grandchildren”， John Keynes，a famous

　　economist, wrote that human needs fall into two classes: absolute needs, which are independent of what others have, and relative needs, which make us feel superior to our fellows. He thought that although relative needs may indeed be insatiable(无止境的), this is not true of absolute needs.

　　Keynes was surely correct that only a small part of total spending is decided by the desire for superiority. He was greatly mistaken, however, in seeing this desire as the only source of insatiable demands.

　　Decisions to spend are also driven by ideas of quality which can influence the demand for almost all goods, including even basic goods like food. When a couple goes out for an anniversary dinner, for example, the thought of feeling superior to others probably never comes to them. Their goal is to share a special meal that stands out from other meals.

　　There are no obvious limits to the escalation of demands for quality. For example, Porsche, a famous car producer, has a model which was considered perhaps the best sports car on the market. Priced at over $120,000, it handles perfectly well and has great speed acceleration. But in 2004, the producer introduced some changes which made the model slightly better in handling and acceleration. People who really care about cars find these small improvements exciting. To get them, however, they must pay almost four times the price.

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