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1.I’m very concerned that today’s children may be heading for social ills because they ____ lots of chances for laughter. 2.As Charles Darwin ___more than a century ago，the individuals best designed to exploit a particular environment tend to produce the greatest number of viable offspring. 3.According to most psychologists, there’s no universal ___ for reproductive success, because different environments, they believe, favor different traits. 4.____and environmental groups，including Greenpeace，say that many parts of the Andes will suffer if they become over-developed. 5.Much of what he said was beyond her comprehension but she understood the ____ of his remarks. 6. Caroling Moore，the first woman fellow of Peter house，Cambridge，points out that gentleman is now used only with irony or ____. 7.Experts say that different countries have different spending needs and make different judgements about the ____ of income to devote to transfers and public services. 8.In the suburbs the spacious houses stand in ____contrast to the slums of the city’s poor 9. Tony seems to know a lot about music, but sometimes I think he's only____ 10. Part of Doraemon’s particular appeal is that he is ready to ____ every situation — and likely, somehow, to get it wrong. 11.Most banks offer____ facilities to students, to help them when they run short of money. 12. The American dream is most____ during the periods of productivity and wealth generated by American capitalism. 13.If early humans hadn’t moved and ____as much as they did, they probably would have continued to evolve into different species. 14.The machine allows segments of the film to be viewed repeatedly and at a so the editor can cut and ____the film. 15.The problem of tracing the disease in such formidable country was ____ further by the continuous warfare in the area. 16.In the coming decades electronic commerce — combined with the growing ease with which firms can shift their operations from one part of the world to another — will make it even eas…… 17. The sun began to the morning mist, and accompanied by the sounds of the waking villages, the pilot switched on the engines and moved upstream. 18. To trap animals a hunter fixes a ____, usually made of cord, across the path they are likely to take. 19. People who love in crowded cities often experience breathing problems during the summer when high temperature combine with ____polluted air. 20.When Dr. Robert Biggar, an epidemiologist at the National Cancer Institute, over____African hospital records looking for earlier descriptions of AIDS-like illness, he didn’t find a……

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