【題目】_______ nature reserves _______ us learn more about protecting animals.

A. Studying; helps B. Studies; to help

C. Study; helping D. Studying; help

【答案】A

【解析】句意：研究自然保護區(qū)有助于我們更多地了解保護動物。動詞短語或動詞做主語時，用動名詞，謂語動詞用單數(shù)形式；結合句意和語境可知選A。

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