2. We can learn from the study published on the Nature website that　.　

　　A. plants’flowering is 8. 5 times faster than leafing

　　B. there are 1, 634 plant species on the four continents

　　C. scientists should improve the design of the experiments

　　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.

　　【参考答案】1—4、BCBD

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