【題目】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】考查形容詞。句意：結(jié)果證明是阿司匹林不僅對退燒和鎮(zhèn)痛極為重要，而且對其他病癥也有輔助作用。“證明”是系動詞，系動詞后填形容詞。根據(jù)句意得知是“重要的”意思。因此填vital。

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