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请阅读短文，完成此题。
Here's a warning from health experts: Sitting is deadly. Scientists are increasingly warningthat sitting for prolonged periods--even if you also exercise regularly--could be bad for yourhealth. And it doesn't matter where the sitting takes place at the office, at school, in the car orbefore a computer or TV--just the overall number of hours it occurs.
Research is preliminary, but several studies suggest people who spend most of their dayssitting 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 Ekblom-Bakof the Swedish School of Sport and Health Sciences suggested that authorities rethink how theydefine physical activity to highlight the dangers of sitting.
While health officials have issued guidelines recommending ~nini~num amounts of physicalactivity, 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. Sheexplained that genes regulating the amount of glucose and fat in the body start to shut down.
Even for people who exercise, spending long stretches of time sitting at a desk is still harmful.Tim Armstrong, a physical activity expert at the World Health Organization, said people whoexercise every day--but still spend a lot of time sitting--might get more benefit if that exercisewere spread across the day, rather than in a single bout.
That wasn't welcome news for Aytekin Can,31, who works at a London financial company,and spends most of his days sitting in front of a computer. Several evenings a week, Can alsoteaches jiujitsu, a Japanese martial art involving wrestling, and also does Thai boxing.
"I'm sure there are some detrimental effects of staying still for too long, but I hope that beingactive when I can helps," he said. "I wouldn't want to think the sitting could be that dangerou
本文主要讲述了久坐危害健康，甚至引起死亡的研究发现，也就是文章开头提到的“Sitting is deadly．”(久坐会致命)，C项正确，A项突出了“exercisin9”，偷换了文章主题；B项意为“锻炼身体可能不会缓解久坐的危害”，该说法片面；D选项意为“如何消除久坐的危害 ”，文章倒数第二段提到“Experts said more research is needed to figure out just how much sitting is dangerous，and what might be possible to offset those effects．”．可见目前还没有发现消除久坐危害的对策，故该项错误。
《义务教育数学课程标准（2011年版）》强调，课程内容要反映社会的需要、数学的特点，要符合学生的认知规律。课程内容的组织要重视过程，处理好（）的关系。
设α是某一方程组的解向量，k为某一常数，则kα也为该方程组的解向量。（ ）
案例：
在有理数运算的课堂教学片段中，某学生的板演如下：
针对该学生的解答，教师进行了如下教学：
师：请仔细检查你的演算过程，看是否正确无误？
生：好像正确吧。
请分析例题1、例题2中每一步运算的依据。（10分）
初中数学课程是一门国家课程，其主要内容包括课程目标、教学内容、教学过程和( )等
教师职业道德区别于其他职业道德的显著标志就是（ ）。
对高中数学的评价，下列说法错误的是( )。
