B the greenhouse effect could work in favor of the earth

　　C the best way to overcome the cooling effect would be to burn more fuels

　　D the increased levels of carbon dioxide in the atmosphere could warm up the earth even more quickly

　　【参考答案】46-50BCBAB

　　较难题目特训：人物故事类

　　Tim Richter and his wife, Linda, had taught for over 30 years near Buffalo, New York—he in computers, she in special education. “Teaching means everything to us, " Tim would say. In April 1998, he learned he would need a heart operation. It was the kind of news that leads to some serious thinking about life’s purpose.

　　Not long after the surgery, Tim saw a brochure describing Imagination Library, a program started by Dolly Parton’s foundation(基金会) that mailed a book every month to children from birth to age five in the singer’s home town of Sevier, Tennessee. “I thought, maybe Linda and I could do something like this when we retire, “ Tim recalls. He placed the brochure on his desk, “as a reminder. "

　　Five years later, now retired and with that brochure still on the desk, Tim clicked on imaginationlibrary. com. The program had been opened up to partners who could take advantage of book and postage discounts.

　　The quality of the books was of great concern to the Richters. Rather than sign up online, they went to Dollywood for a look-see. “We didn’t want to give the children rubbish, " says Linda. The books—reviewed each year by teachers, literacy specialists, and Dollywood board members—included classics such as Ezra Jack Keats’s The Snowy Day and newer books like Anna Dewdney’s Llama Llama series.

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