单选题
{{B}}Passage One{{/B}}

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 be cause 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 challenge of the interlink between the environment and development increasingly bring us to the core of the economic life of states. During the bate 1980s we were able, through international agreements, to make deep cuts in emissions harmful to the ozone layer (臭氧层). 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 (抵消) 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 coz 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 (人口众多的) low or 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 21^stcentury.
Such a commitment would require a degree of shared vision and common responsibilities new to humanity. Success lies in the force of imaginations, in imaging 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.

【正确答案】 C

【答案解析】主旨题。本题主要是考查考生对整篇文章的综合理解能力。从全文看，主要是分析全球气候变暖问题，所以C是正确答案。因为文章中已说明全球已经意识到全球气候变暖的威胁，而且应该减少对臭氧层有害的气体的排放，因此A与D都与此不符。文章也不是旨在指责某些国家拒绝采取措施减少对臭氧层有害的气体的排放量，所以B也不对。