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have been influencing our life more and more．B.Advertisements can be useful by providing US direct，comprehensive and detailed in formatlon．C.Advertisements can provide US product information．D.Advertisements are necessary for US in our life． 参考答案： B Advertisements can be useful by providing US direct，comprehensive and detailed in formatlon．----------------------------------------2、Read the following paragraph and underline the topic sentence．In the crowded areas of high pollution，such as LOS Angles，it is estimated that people are losing about 10 years，on the average，of their life spans．Diseases related to air pollution，such as emphysema，are more and more common in younger and younger people．Con tinued rapid growth of the human population will lead to more pollution and a lower standard of health for everyone．More polluting cars will be needed for transport；more polluting factories will be needed tO produce goods．More fertilizer and pesticide pollution will occur as people attempt to grow more and more food． 参考答案： Continued rapid growth of the human population will lead to more pollution and a lower standard of health for everyone． Continued rapid growth of the human population will lead to more pollution and a lower standard of health for everyone．----------------------------------------3、Read the following paragraph carefully and select the best topic sentence from the four possible answers that follow the paragraph．Topic Sentence：At the university of Kansas Art Museum，investigators tested the effects of different colored walls on two groups of visitors to an exhibit of paintings．For the first group the room was painted white；for the second，dark brown．Movement of each group was followed by an electrical system unde
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