单选题：Delaying the age at which screening starts may ___________.

题目分类：理工类
题目类型：单选题
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题目内容：

Delaying the age at which screening starts may ___________. A．be costly
B．harmful
C．save a life
D．still open to debate
E．reduce the risk of radiation triggering a cancer
F．reduced to the minimum

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