【題目】My grandpa knows the history and medical _______ of many plants.

A. wealth B. price C. value D. cost

【答案】C

【解析】句意：我爺爺知道許多植物的歷史和藥用價值。A是財富、財產(chǎn)；B是價格；C是價值；D是成本。根據(jù)題干可知我爺爺知道許多植物的歷史和藥用價值，故選擇C。

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