PASSAGE FOUR [br] What can we learn from the passage about the prevention of all

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问题 PASSAGE FOUR [br] What can we learn from the passage about the prevention of all colds?

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答案 It is very difficult．

解析根据prevention of all colds定位到最后一段。该段提到已有科学家研制出预防某种细菌引起的感冒的疫苗，但文章最后指出感冒病毒非常多，要预防所有感冒意味着要研发针对所有感冒病毒的疫苗，暗示出预防所有感冒很困难。故答案可填It is very difficult。

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PASSAGEFOUR[br]Accordingtothepassage,whatcouldbebroughtaboutbyself-