People are doing many things to try to stop global warming .One thing is carpooling—driving with someone to a place that you are both going to. Another thing is being more careful about leaving electrical devices turned on. Now,more people are even riding buses or bikes to lower the amount of greenhouse gases in the air .Although adults do many things to help stop global warming,kids call do just as much.

　　46. By the example given in Paragraph l, the author wants to__________.

　　A. explain how global warming happens

　　B. show his feeling in a car in hot summer

　　C. tell us cars are causes of greenhouse gases

　　D. say that I there are greenhouse gases in every car

　　47. The underlined word‘it” in Paragraph 2 refers to__________.

　　A. light

　　B. greenhouse effect

　　C. temperature

　　D. heat

　　48. What is the effect of at mosphere?

　　A. IT only traps the heat of the sun.

　　B. It does great harm to humans.

　　C. It makes the earth neither to hot nor too cold.

　　D. It prevents all the light from the sun shining on the earth.

　　49. What is the main idea of the third paragraph?

　　A. lf there is greenhouse effect．all the plants will die

　　B. Human beings are likely to disappear from the earth

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