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servings. For example, movie theatres offer an extra large box of

popcorn(爆玉米花)，which, at almost 900 calories, is equivalent to a

major meal. Health professionals warn that as children, adolescents(青少年),and

adults learn to prefer large portions and tasty foods high in fat,sugar,and calories,

there has been a corresponding increase in rates of being overweight(from 25% in 1988

to 34% in 1998).Researchers are especially concerned about the continued rates of overweight

and obesity(肥胖) in children since childhood obesity is very difficult to treat and an obese

child has a high probability of becoming an obese adult with the associated health risks we

discussed earlier.

Health professionals suggest that to avoid future increases in rates of overweight and

obesity, we need to try hard to forget many of our food associations, which primarily

involves decreasing size of food portions, increasing levels of activity to burn off

excess calories.

26.The influence of food association can be seen clearly from the example that we often eat NOT

because________.

[A]it's time for lunch

[B]we're hungry

[C]foods smell delicious

[D]our friends are eating

27.From the passage we can infer that the "serving" in the second paragraph most

probably means________.

[A]an amount of food

[B]a special service

[C]a meal

[D]some calories

28.According to the author, because of an unhealthy food preference, the increase in rates of being

overweight was almost _____________ during the ten years from 198 to 1998.

[A]10 per cent [B]20 per cent

[C]30 per cent [D]40 per cent

29.According to the passage, an obese child is _____________.

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