2017届山西省大同县高三英语一轮阅读理解训练（3）及答案_高考复习指南

　　C．prevent the sun’s rays from reaching the earth’s surface

　　D．explain the cause of great changes in the climate in the northern hemisphere

　　47．The article was written to explain

　　．

　　A．the green house effect

　　B．the solar effects on the earth

　　C．the causes affecting weather

　　D．the models of solar weather interactions

　　48．Although the fuel consumption is greater in the northern hemisphere, temperatures there seem to be falling．This is

　　．

　　A．mainly because the levels of carbon dioxide arc rising

　　B．partly due to changes in the output of solar energy

　　C．possibly because the ice caps in the poles are melting

　　D．only due to the effect of the inertia of the earth’s climate

　　49.On the basis of their models, scientists are of the opinion that

　　A the climate of the world should be becoming cooler

　　B the new Ice Age will be delayed by the greenhouse effect

　　C the man-made warning effect helps to increase the solar effects

　　D it will take thousands of years for the inertia of the earth’s climate to take effect

　　50.If the assumption about the delay of a new Ice Age is correct

　　A ice would soon cover the northern hemisphere

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