A. to show chemical batteries are widely applied

　　B. to indicate nuclear batteries can be safely used

　　C. to describe a nuclear-powered system

　　D. to introduce various energy sources

　　3. Liquid semiconductor is used to 　.　

　　A. get rid of the radioactive waste

　　B. test the power of nuclear batteries

　　C. decrease the size of nuclear batteries

　　D. reduce the damage to lattice structure

　　4. According to Jae Kwon, his nuclear battery 　.　

　　A. uses a solid semiconductor

　　B. will soon replace the present ones

　　C. could be extremely thin

　　D. has passed the final test

　　5. The text is most probably a 　.　

　　A. science news report

　　B. book review

　　C. newspaper ad　

　　D. science fiction story

　　【参考答案】31.1-5 CBDCA

　　【北京市东城区检测C

　　Going Green

　　For career（职业） changers thinking about growth and advancement potential, forget the blue-collar and white-collar categories: Green is the way to go. According to Bracken Hendricks, a senior fellow at the Center for Global Progress, careers that promote environmental responsibility will become main stream within a decade. “The growth in green careers will be like the Internet boom, which not only created new jobs, but also had an influence on the overall economy（经济）,” he says.

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