Scientists believe the world’s average temperature has risen by about 0. 8℃ since 1900, and nearly 0. 2 ℃ every ten years since 1979.

　　So far, efforts to cut emissions (排放) of planet- warming greenhouse gases are not seen as enough to prevent the Earth heating up beyond 2℃ this century—a point scientists say will bring the danger of a changeable climate in which weather extremes are common, leading to drought, floods, crop failures and rising sea levels.

　　1. What is the key information the author wants to give in Paragraph 1?

　　A. Plants’reaction to weather could have damaging effects on ecosystems.

　　B. The increasing speed of flowering is beyond scientists’expectation.

　　C. Climate change leads to the change of food production patterns.

　　D. Food chains have been seriously damaged because of weather.

　　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

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