答案： B　主旨大意题。第三段第一句话以及第四段第一句话都是在提醒那些想减肥的人：不吃早餐能减肥是错误的做法。由此不难看出本文的对象是那些想减肥的人。

　　B

　　Obesity is becoming one of the biggest threats to children's health, a recent nationwide investigation has warned, pointing out that students' physical indicators are declining because of a lack of enough exercise.

　　The past five years have witnessed fast growth in the number of fat children—in some big cities, the number has even doubled, the survey showed.

　　In Beijing, for example, latest figures from the local education authorities show that the height, weight and chest measurement of young students keep expanding, while physical indices (指数，指标), such as lung capacity, speed and strength, are going down.

　　The blood pressure of half the secondary school students is above normal, and the number of obese students has increased by 50 percent compared with five years ago.

　　In the urban areas of Beijing and five other economically more developed regions, the average obesity rate of male students in primary schools has reached 12.9 percent.

　　Nationwide, the obesity rate of children is 8.1 percent and 3.1 percent in urban and rural areas.

　　“China has entered the era of obesity，” Beijing­based Worker's Daily quoted Ji Chengye of the Child and Adolescent Health Section of the China Preventive Medicine Association as saying. “Childhood is the first age group affected by obesity, to which society has not paid enough attention，” Ji said. “Obesity in childhood will influence health for life，” the expert added.

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