The increase in indoor activities such as watching television, surfing the Internet, playing computer games or doing homework, is one of the main reasons for children's obesity, according to Ji, because it means lack of exercise and little chance for burning calories. Another reason is consumption of excessive junk food. “In the past, children used to drink water. Now they prefer sweet beverages; and some have totally given up water，” Ji said. He also blamed intensive promotions of sweets and junk food, which make it hard for children to resist the temptation.

　　Also, because of pressure of competition to enter good higher schools, teachers sacrifice students' physical exercise time for classes.

　　For instance, about 60 percent of school masters in Beijing admitted that the one hour of outdoor physical exercise per day is not always followed.

　　“Problems of obesity will not only influence children's physical and psychological development but also become a time bomb for the country's future economic development and public health system，” said Chen Chunming, head of International Life Sciences Institute Focal Point in China.

　　5．How many reasons are mentioned in the passage that cause child obesity?

　　A．Two.

　　B．Three.

　　C．Four.

　　D．Five.

　　答案：B　第八、九、十段分别讲述了导致儿童肥胖的原因，即室内活动的增多、吃过多垃圾食品和学校体育活动的取消。

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