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题目来源：
OG4 阅读 Q30
正确答案：D
题目详解
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Choice D is the best answer. In lines 63-64("with a... normally active"), the parenthetical is added after the phrase "a promoter," which is "(...a sequence of DNA that controls gene activity)." The parenthetical's purpose is to define the term "promoter."
Choices A, B, and C are incorrect because they do not correctly identify the purpose of the parenthetical information in lines 63-64("with a... normally active").
Choices A, B, and C are incorrect because they do not correctly identify the purpose of the parenthetical information in lines 63-64("with a... normally active").
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