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igarette smoke has an offensive odor that permeates clothing，stuffed furniture and carpets，smokers oftei~find that they must have these items cleaned more frequently than nonsmokers do．Although it is difficult to estimate the cost of this additional expense，one can see that this hidden expense does contribute to making cigarette smoking an expensive habit． 参考答案： And it is harmful to people’S health． And it is harmful to people’S health．----------------------------------------1、1．They also work in mines，in building，on fishing boats and in rug，glass and match factorleS．2．Others say governments and private organizations must develop programs to help．3．Most experts say that child labor will end only the number of employment increases in thedeveloping countries．4．One proposal is to place restrictions on trade and products made by children．5．Some of these jobs are dangerous to their heah．6．Children in developing countries work mainly in agriculture，and as servants in people’S houses．7．No agreement has been reached about the best way to reduce child labor now． 参考答案： 6153742 6153742----------------------------------------1、Choose the best topic sentence from the group below．Write the letter of the choice in the blank． A.Books are one of the necessities of human beings in a sense．B.Books can broaden our minds and enrich our thinking．C.Books can teach US what can’t be learned from practice．D.Books are changing our life in some way． 参考答案： A Books are one of the necessities of human beings in a sense．----------------------------------------2、Read the following paragraph and underline the topic sentence．Social customs and ways of behavior have been changing．Things which were considered impolite many years a
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