There may be a threshold below which blood pressure reductions become ______given that a long-running study showed no decreased

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问题 There may be a threshold below which blood pressure reductions become ______given that a long-running study showed no decreased heart risk for drops in blood pressure below a certain point.

选项

答案E

解析 The portion of the sentence that begins with "given that" provides a reason for a conclusion reached in the first part of the sentence. Since the study "showed no decreased heart risk for drops in blood pressure below a certain point," that point may be a threshold below which reductions in blood pressure provide no benefit; that is, they may be "superfluous."
Thus, the correct answer is superfluous(Choice E).
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