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The newly-discovered medicine had its ______ only on ordinary colds.A. effectB. affectC. impressionD. influence

The newly-discovered medicine had its ______ only on ordinary colds.

A. effect

B. affect

C. impression

D. influence

题目解答

答案

A. effect

解析

本题考查名词与介词的固定搭配以及语境理解。关键点在于：

"effect"与"on"的搭配：短语"have effect on"表示“对...产生效果/影响”。
排除干扰项：需区分"affect"（动词，直接跟宾语）、"impression"（强调“印象”）、"influence"（强调“较大影响”）的语境适用性。

选项分析

A. effect

固定搭配："have effect on"表示“对...有效果”，符合句中“药物仅对普通感冒起作用”的语境。
语法匹配："effect"是名词，与"its"搭配正确。

B. affect

错误原因："affect"是动词，需直接跟宾语（如"The medicine affects colds"），不能与"on"连用。

C. impression

语境不符："impression"指“印象”，与药物疗效无关。

D. influence

程度差异："influence"常指较大、长期的影响，而句中强调药物的直接作用，用"effect"更贴切。

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