高三一轮复习单元检测题五

　　第二部分：阅读理解

　　第一节(共20小题；每小题2分，满分40分)

　　A

　　LONDON----Here’s a new warning from health experts: Sitting is deadly.

　　Scientists are increasingly warning that sitting for prolonged periods---even if you also exercise regularly---could be bad for your health. And it doesn’t matter where the sitting takes place ---at the office, at school, in the car or before a computer or TV---just the overall number of hours it occurs. Several studies suggest people who spend most of their days sitting are more likely to be fat, have a heart attack or even die.

　　In an editorial published this week in the British Journal of Sports Medicine, Elin EkblomBak of the Swedish School of Sport and Health Sciences suggested that authorities rethink how they define physical activity to highlight the dangers of sitting.

　　While health officials have issued guidelines recommending minimum amounts of physical activity, they haven’t suggested people try to limit how much time they spend in a seated position.

　　"After four hours of sitting, the body starts to send harmful signals," Ekblom-Bak said. She explained that genes regulating(调节) the amount of glucose（葡萄糖） and fat in the body start to shut down.

　　Even for people who exercise, spending long periods of time sitting at a desk is still harmful. Tim Armstrong, a physical activity expert at the World Health Organization, said people who exercise every day---but still spend a lot of time sitting---might get more benefit if that exercise were spread across the day, rather than in a single bout.（一回）

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