(2014·烟台市第二次诊断)Vitamin D helps our bodies make a special chemical，and this speci

题干

(2014·烟台市第二次诊断)Vitamin D helps our bodies make a special chemical，and this special chemical，________，affects our brains，making us feel happy.

A．in turn	B．in particular
C．in advance	D．in short

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