题目内容
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According to record, tobacco smoking first started in Central and South America. About 500 years 1 , explorers (探险家) who went there with Columbus 2 back to Europe the 3 of pipe (烟斗) smoking which they had 4 from the American Indians. It was 5 into China in Ming Dynasty. Cigarette smoking became 6 in Europe during the 1900's, 7 after World War Ⅰ and World War Ⅱ.
For centuries, scientists have doubted (怀疑) the harms (危害) of 8 smoking. But only 9 the 1950's, scientists have found 10 proofs (证据) to show the 11 . Cigarette smoking is linked (有联系的) to many disease. 12 the middle of this century to the present, 60 million people died from 13 in the developed countries. If the present 14 continues, 15 30 years there will be 10 million deaths each year, 16 this number 70% deaths will be in the third world countries.
In China there are 300 million smokers. They not only harm their own health but also harm 17 . Statistics (统计) show that there are 400 18 passive (被动的) smokers. Passive smokers are 19 who do not smoke themselves but people 20 them smoke. Passive smoking is likely (可能) to cause many diseases.
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