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.
【C9】
选项 A、burn up
B、burns up
C、are burned up
D、burning up
答案C
解析 该选项涉及比较级中as和than的用法。这两个连词似乎具有代词的功能，后面的句子可以没有主语，而谓语动词是单数还是复数取决于前面相关的代词或名词，在此短文中，因为than前面的名词是calories(复数形式)，而burn up需要被动形式，所以选are burned up。
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