D.the experiments failed to predict how plants react to climate change

　　3.Scientists pay special attention to the study of plants because 　. 

　　A.they can prove the climate change clearly

　　B.they are very important in the food chains

　　C.they play a leading role in reducing global warming

　　D.they are growing and flowering much faster than before

　　4.What can be inferred from the last two paragraphs about the world’s temperature?()

　　A.It has risen nearly 0.2℃ since 1979.

　　B.Its change will lead to weather extremes.

　　C.It is 0.8℃ higher in 1979 than that of 1900.

　　D.It needs to be controlled within 2℃ in this century.

　　语篇解读:本文为说明文,题材为科普知识类。温室效应已经影响了植物的生长类型,由于植物在食物链和生态系统中有着重要影响,科学家们正致力于研究其生长变化。

　　答案及剖析:1.B　主旨大意题。根据第一段Plants are flowering faster than scientists predicted(预测)in reaction to climate change...可知本题应选择B项。

　　2.C　事实细节题。根据文章第五段最后一句话It found that some experiments had underestimated(低估)the speed of flowering...以及第七段The design of future experiments may need to be improved to better predict...可知本题应选择C项。

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