单选题Doctor Volkow was astonished because _____ .Aher research has shed light on her understanding of cell phoneBshe found that cell phone exposure is harmful to human brainCshe found that using a cell phone for about 50 minutes could influence or change brain activityDhuman brain is not responsive to electromagnetic radiation

单选题
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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