At the Kyoto conference on global warming in December 1997, it became abundantly clear how complex it has become to work out int

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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(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 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(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 21th century. Such a commitment would require a degree of shared vision and common responsibilities new to humanity. Success lies in the force of imagination, 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.
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 作者写这篇文章的目的也就是文章所要表达的主旨。通分析文章我们可知,第一段讲到,就全球变暖的问题召开国际会议进行讨论。第二段讲到,所有的国家领导人都知道要解决这个问题,但是,如果不进行有效的配合,各国所采取的措施之间产生的效果可能被相互抵消;要想彻底解决二氧化碳问题也是不切实际的。第三段讲到,我们必须找到解决全球变暖威胁的办法。可见,文章主要要讲的是全球变暖的问题。只有C项与文章的意思相符。所以应该选C。
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