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    【题目】Not only has aspirin proved________for reducing fever and helping stop pain,but there are also other things that aspirin can help with.

    【答案】vital

    【解析】考查形容词。句意：结果证明是阿司匹林不仅对退烧和镇痛极为重要，而且对其他病症也有辅助作用。“证明”是系动词，系动词后填形容词。根据句意得知是“重要的”意思。因此填vital。

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