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题目来源：
OG4 阅读 Q24
正确答案：C
题目详解
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Choice C is the best answer. In lines 19-21("Dairy... with milk"), the author explains that dairy animals are "expert," or capable, "protein producers."
Choices A, B, and D are incorrect because in this context "expert" does not mean knowledgeable, professional, or trained.
Choices A, B, and D are incorrect because in this context "expert" does not mean knowledgeable, professional, or trained.
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