2. 外语
  3. Obesity has become a household word in the United States. Today, about one【C1】______ three American kids is overweight, nearly【C

Obesity has become a household word in the United States. Today, about one【C1】______ three American kids is overweight, nearly【C

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问题     Obesity has become a household word in the United States. Today, about one【C1】______ three American kids is overweight, nearly【C2】______the rate in 1963. Childhood obesity is the No. 1 health【C3】______among American parents, topping drug abuse and smoking. Obesity is among the easiest medical conditions to recognize but most difficult to treat. Unhealthy weight gain due to poor diet and lack of exercise【C4】______over 300,000 deaths annually.
    Obesity is causing a broad range of health problems that【C5】______weren’t seen until adulthood, including high blood pressure. There are also psychological effects: Obese children are more【C6】______to low self-esteem, negative body image and depression. They are much more likely to become overweight adults【C7】______they maintain healthier【C8】______of eating and exercise.
    The causes of obesity are extremely complicated. Obesity occurs when a person eats more calories than【C9】______. If one parent is obese, there is a 50 percent chance that their children will be obese.【C10】______certain medical disorders can cause obesity, less than 1 percent of all obesity arises from physical problems.
【C7】
选项 A、if
B、once
C、since
D、unless
答案D
解析 空白处前面文字的意思是“很可能成年时发福”，而后面文字的意思是“保持健康的饮食和运动方式”，只有unless(除非)是合适的，承接前后的关联条件。
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