GMAT 考满分题库

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.
  • Areducing anxiety, relaxing the brain, and in regulating 分析该选项
  • Bmeans of reducing anxiety, relaxing the brain, and in the regulation of 分析该选项
  • Creducing anxiety, relaxing the brain, and regulation of 分析该选项
  • Dreducing anxiety, relaxing the brain, and regulating 分析该选项
  • Emeans of reducing anxiety, relaxing the brain, and regulating 分析该选项
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正确答案: D

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