单词：history of preventive inoculation
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[00:06.14]See, what I didn't want was to turn out boys 我不想去培养这样的一批人 [00:10.22]who would claim in later life to have a deep love of literature. 他们以后才会说深爱着文学 [00:12.82]Or who would talk in their middle ag
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The History Of Smallpox天花的历史（双语） In Shakespeares day, wishing a pox on someone was a terrible curse. Ten percent of the population in 17th century London died gruesomely of smallpox, a virus spread easily by airborne particles or co
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Next time your parents tell you a penny save does a penny earn,you tell them not always!!We're gonna tell you how much more a peny is worth a little later on today.CA, welcome to a new week of CNN student news. First up today,we are talking about U.S
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Test 6Section CIf you are a young college student, most of your concerns about your health and happiness in life are probably (36) ______ on the present. (37) ______ , you want to feel good physically, mentally, and (38) ______ now. You probably don'
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Economics Brief 经济学简介 Six Big Ideas 六大经济理论 Human capital: The people's champion 人力资本：人的捍卫者 Gary Becker made humans the central focus of economics. The second in our series on big economic ideas. 贝克尔让人
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By CCTV Tang Bo Chinas three major hepatitis B vaccine makers have been ordered to suspend production. The countrys Food and Drug Administration made the announcement after the companies failed to get certified under the new Pharmaceutical Products s
CCTV9英语新闻2014年01月