69．The underline word “identical” in the last paragraph probably means________.

　　A. totally different B. exactly the same

　　C. extremely important D. partly independent

　　答案：B　猜测词义题。唯一能证明全球变暖百分之百是人类活动引起的办法是运行两个“完全相同的”地球，一个有人类影响，一个没有。

　　70．Which of the following can be the best title?

　　A. Are All the Scientists Really Scientific?

　　B. Where Is Global Warming Leading Us to?

　　C. Are Humans Definitely Causing Global Warming?

　　D. What's Relation of Global Warming and Greenhouse Gases?

　　答案：C　主旨大意题。由文章大意可知，本文主要讲述了人类活动造成全球变暖这一理论的探究，所以C项符合。

　　E

　　(2017·淄博一模)

　　In Wiltshire, England, volunteers are being sought to visit a nature protection area to count the butterflies living there and on surrounding fields. The project is promoted by an environmental protection organisation, which has contributed to improving the living environment for wild animals. Recently，the organisation has issued an appeal to help it observe environmental changes based on the record of butterflies and protect the environment.

　　In the area, the local people have planted many special flowers with the help of the organisation，aiming to see whether these flowers will interest the rare and beautiful butterflies. The Project officer Sarah Marshall says, “It will be a suitable habitat(栖息地) for butterflies. They are great ‘indicator species’ as they are easily affected by climate changes so they make a brilliant early­warning system for the environment.” She also points out that volunteers are needed to recount the number or species of butterflies，and based on the change happening to the butterflies, the hidden environmental problems

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