单选题 The environmentalists started a ＿＿＿＿＿＿＿＿＿＿＿＿＿ against animal killing. 的答案

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题目内容：
The environmentalists started a ＿＿＿＿＿＿＿＿＿＿＿＿＿ against animal killing.
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