单选题：Doctor Volkow was astonished because__________.

题目分类：成人英语三级
题目类型：单选题
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题目内容：

Doctor Volkow was astonished because__________. A．her research has shed light on her understanding of cell phone
B．she found that cell phone exposure is harmful to human brain
C．she found that using a cell phone for about 50 minutes could influence or change brain activity
D．human brain is not responsive to electromagnetic radiation

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