答案:B

　　24.The attitude of the writer towards squirrels is 　. 

　　A.objective B.appreciative

　　C.negative D.indifferent

　　解析:推理判断题。根据文章最后一段的内容可知,作者对松鼠是持赞赏态度的。

　　答案:B

　　B

　　It’s true that quite a few most respected scientific authorities have confirmed that the world is becoming hotter and hotter.There’s also strong evidence that humans are contributing to the warming.Countless recent reports have proved the same thing.For instance,a 2011 summary about the climate science by the Royal Society noted that:“The global warming over the last half-century has been caused mainly by human activity.”

　　You may not believe that humans could change the planet’s climate,but the basic science is well understood.Each year,billions of tons of greenhouse gases are released into the atmosphere because of human activity.As has been known for years,these gases hold heat that would otherwise escape to space,wrapping the planet in an invisible blanket.

　　Of course,the earth’s climate has always been changing due to “natural” factors such as volcanic eruption or changes in solar,or cycles concerning the Earth’s going around the sun.According to the scientific research,however,the warming observed by now matches the pattern of warming we would expect from a build-up of greenhouse gas in the atmosphere—not the warming we would expect from other possible causes. 

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