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  3. Our knowledge of the pains animals feel can be obtained through Pain is vital to the survival of human being and all mammalian

Our knowledge of the pains animals feel can be obtained through Pain is vital to the survival of human being and all mammalian

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问题 Our knowledge of the pains animals feel can be obtained through
Pain is vital to the survival of human being and all mammalian because
选项 A、it can be found in vertebrates.
B、it consists of nervous elements.
C、it underlies mental life.
D、it is a response to harmful stimuli.
答案D
解析 细节题。文章第二段开头部分论证了疼痛具有使动物生存下去的生物意义；疼痛是对潜在的危险刺激物的反应。两者由therefore"因此"连接，为因果关系，所以"它是对危险刺激物的反应"符合文意。"它能在脊椎动物中找到"，"它包含神经要素"和"它构成精神生活的基础"都不符合文章的意思。
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