At the Kyoto conference on global warming in December 1997, it became abunda

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问题 At the Kyoto conference on global warming in December 1997, it became abundantly clear how complex it has become to work out international agreements relating to the environment because of economic concerns unique to each country. It is no longer enough to try to forbid certain activities or to reduce emissions of certain substances. The global challenges of the interlink between the environment and development increasingly bring us to the core of the economic life of states.
During the late 1980s we were able, through international agreements, to make deep cuts in emissions harmful to the ozone layer. These reductions were made possible because substitutions had been found for many of the harmful chemicals and, more important, because the harmful substances could be replaced without negative effects on employment and the economies of states.
Although the threat of global warming has been known to the world for decades and all countries and leaders agree that we need to deal with the problem, we also know that the effects of measures, especially harsh measures taken in some countries, would be nullified if other countries do not control their emissions. Whereas the UN team on climate change has found that the emissions of carbon dioxide would have to be cut globally by 60 % to stabilize the content of CO2 in the atmosphere, this path is not feasible for several reasons. Such deep cuts would cause a breakdown of the world economy. Important and populous lower medium-income countries are not yet willing to undertake legal commitments about their energy uses. In addition, the state of world technology would not yet permit us to make such a big leap.
We must, however, find a solution to the threat of global warming early in the 21st century. Such a commitment would require a degree of shared vision and common responsibilities new to humanity. Success lies in the force of imaginations, in imagining what would happen if we fail to act. Although many living in cold regions would welcome the global-warming effect of a warmer summer, few would cheer the arrival of the subsequent tropical diseases, especially where there had been none. [br] The main purpose of this passage is to______.

选项 A、convince people that global warming is a real threat
B、criticize some countries for refusing to cut down emissions harmful to the ozone layer
C、analyze the problem of global warming
D、argue against making deep cuts in emissions

答案 C

解析本题问本文的主要目的是什么。全文第一段指出，1997年12月在京都召开会议，讨论全球变暖问题。在这次会议上，有充分的迹象表明，制定出一个有关环境的国际协定是多么的复杂，因为各国有其特殊的经济利益。第一段的其他部分和第二段主要从经济的角度具体分析了减少污染所面临的难题。文章最后一段指出了减少污染的必要性。因此，本题的正确答案应是C“分析全球变暖问题”。

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