Even if scientists did discover another reasonable explanation for the warming recorded so far,that would give birth to a difficult question.As Robert Henson puts it:“If some newly discovered factor is to blame for the climate change,then why aren’t carbon dioxide and the other greenhouse gases producing the warming that basic physics tells us they should be?”

　　The only way to prove with 100% certainty that humans are responsible for global warming would be to run an experiment with two identical Earths—one with human influence and one without.That obviously isn’t possible,and so most scientists are careful not to state human influence as an absolute certainty.

　　25.From the underlined sentence in Paragraph 3,we know that the writer 　. 

　　A.thinks humans have made great contributions to the environmental protection

　　B.thinks human activities are mainly responsible for the global warming

　　C.thinks the global warming has nothing to do with human activities

　　D.thinks “natural” factors play a big part in causing the global warming

　　解析:作者观点题。在第三段中,作者首先承认了存在导致全球气候变暖的自然因素,但进一步指出,人类排放的温室气体也难辞其咎。

　　答案:B

　　26.The text is developed by 　. 

　　A.giving typical examples

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