As the phenomenon of blushing is rooted in the nervous system, which then causes a dilation of small blood vessels in the face.

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问题 As the phenomenon of blushing is rooted in the nervous system, which then causes a dilation of small blood vessels in the face.

选项 A、The phenomenon of blushing
B、While the phenomenon of blushing
C、Since the phenomenon of blushing
D、That a phenomenon of blushing

答案A

解析
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