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课时作业(二十) (时间：45分钟 满分：100分) Ⅰ.单句语法填空 1．Three years ago, a society was set up to_preserve (preserve) the endangered animal and plant life from dying out in this area. 2．Nowadays, people get news around them and about the world from various (variety) media, on TV, by radio, in the newspaper or on the Internet. 3．(2017·新课标全国卷Ⅱ阅读B)Advanced (advance) lights, motors, and building designs have helped save a lot of energy and therefore prevented pollution. 4．By the activities in our English club, we not only practise but also learn more English. 5．The coastal areas have mild winters, but by contrast the central (center) plains become extremely cold. 6．Sam has gained the admission (admit) to a famous university. 7．—Hey, John！The boss has just announced your promotion at the morning meeting. —Really? No wonder everyone I met just now said congratulations to me. 8．Whoever leaves the room last should remember to turn off the lights. Ⅱ.单句改错 1．We must take some measures to preserve the endangered animals from killed.from后加being 2．Only by improving education and high science technology can a country become a advanced one.第二个a→an | 
