题目信息
Foods high in tryptophan, an amino acid that is a precursor to serotonin, can help people to fall asleep by reducing anxiety, relaxing the brain, and in regulating the sleep cycle.
A:reducing anxiety, relaxing the brain, and in regulating
B:means of reducing anxiety, relaxing the brain, and in the regulation of
C:reducing anxiety, relaxing the brain, and regulation of
D:reducing anxiety, relaxing the brain, and regulating
E:means of reducing anxiety, relaxing the brain, and regulating
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已选答案：
正确答案：
D:reducing anxiety, relaxing the brain, and regulating
reducing anxiety, relaxing the brain, and regulating the sleep cycle三个短语平行
只有D平行
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