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  3. A study by tracing the history of the emergence and spread of 335 infectious diseases from 1940 to 2004 provides a new point of

A study by tracing the history of the emergence and spread of 335 infectious diseases from 1940 to 2004 provides a new point of

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问题 A study by tracing the history of the emergence and spread of 335 infectious diseases from 1940 to 2004 provides a new point of view on ________.
According to the survey made by Jones and her colleagues, new diseases arise as a result of dramatic increases in population, international trade and travel, and ________.
选项
答案changes to agricultural practices
解析 根据题干中的the survey和dramatic increases定位到原文第六段第三句The survey paints a picture．．．arise as a result of dramatic increases in human population density．．．international trade and travel，and changes to agricultural practices．本题问的是导致新疾病出现的原因。题干中已经列出了人口密度、国际贸易和旅行的急剧增加等因素，根据原文句子可以看出需要填的是导致新疾病出现的原因之一。题干和原句的句子结构一致，答案显而易见，是农业活动的改变，即changes to agricultural practices。
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大学英语六级

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