Bad eating habits, increased food availability, increasingly sedentary lifestyle and reduced physical activity are the first fou

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问题 Bad eating habits, increased food availability, increasingly sedentary lifestyle and reduced physical activity are the first four causes of the obesity epidemic.
Mothers’ getting older and  ______ could also account for the obesity epidemic.

选项

答案more single children/firstborns

解析 本题涉及到母亲的年龄与肥胖流行的关系,从而将题目出处定位到Mature Mums部分。该部分第三段末句提到,母亲年龄变大和独生子女的增多可能也导致了肥胖流行,因此可以获知答案是独生子女的增多。
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