2. 外语
  3. To study predators, one must adopt the role of______that is, refrain from interfering with an animal’s natural behavior.

To study predators, one must adopt the role of______that is, refrain from interfering with an animal’s natural behavior.

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问题 To study predators, one must adopt the role of______that is, refrain from interfering with an animal’s natural behavior.
选项
答案C，D
解析 that is说明前后同义重复。空格与refrain from interfering with an animal’s natural behavior(避免干扰动物的自然行为)同义重复。vigilante警戒人员，arbiter仲裁者，observer观察者，spectator观察者，specialist专家，judge仲裁者。答案选CD。注：这里arbiter和judge是干扰项，同表示“仲裁者”。
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