单选题
Most middle-aged people get fatter, mainly because ______.
A、
they made dietary changes when they grow old
B、
of their sedentary living
C、
they don't exercise regularly
D、
the chemical activity in their body that uses the food to produce energy slows down
【正确答案】
D
【答案解析】
文中第四段给出中年人会发福的原因之一是your metabolism would slow down as you get older，选项D意思是体内用以产生能量的化学分解活动速度减慢，与原文新陈代谢减慢符合。
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