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    Scientists need to do a lot of research / experience and experiments before they can understand and find a cure for things. 【查看更多】

     

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    Scientists need to do a lot of ______and experiments before they can understand and find a cure for things.
    A. search      B. resources   C. research    D. experience

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    Scientists need to do a lot of ______and experiments before they can understand and find a cure for things.
    A. search      B. resources   C. research    D. experience

    查看答案和解析>>


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