11．One of the basic principles of wildlife protection involves _______ adequate natural food and shelter to maintain populations of each species in a given environment．（　�。�
A．providedB．providingC．to provideD．provide

分析 野生動物保護的其中一條基本準則涉及為各種生物提供充分的自然食物和庇護．

解答 答案：B   involve沒有加to do的用法，最常用的是：involve sb．in doing sth．將某人卷入某事，be involved in doing sth．被卷入某事，involve （doing） sth．涉及（做）某事
involve后面要跟名詞性短語，這里面providing是動名詞作involve的賓語． 故選B．

點評 了解句中關(guān)鍵動詞的用法，可以幫助我們更準確地分析所用的動詞的適當形式．

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