按照不同的角度，语法现象可以分为“词法部分和句法部分”、“组合规则和聚合规则”、“核

现代社会对能源的需求量越来越大。下列图示中，不是利用环保新能源发电的是

在C++程序中，如果要求通过函数来实现一种简单的功能，并且要求尽可能加快序执行速度，则应该选用( )。

A．内联函数

B．重载函数

C．递归调用

D．嵌套调用

收费员职业道德内容是什么？

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   1 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   2  .

Research is preliminary, but several studies   3 people who spend most of their days sitting are more likely to be fat, have a heart attack or even die.

In an editorial   4 this week in the British Journal of Sports Medicine, Elin Ekblom-Bak of the Swedish School of Sport and Health Sciences suggested that authorities rethink how they define   5 activity to highlight the dangers of sitting.

While health officials have issued guidelines   6 minimum amounts of physical activity, they haven't suggested people try to limit how much time they spend in a seated   7  .

"After four hours of sitting, the body starts to send   8 signals," Ekblom-Bak said. She explained that genes regulating the amount of glucoseand fat in the   9 start to shut down.

Even for people who   10  , 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 who exercise every day —   11 still spend a lot of time sitting — might get more benefit if that exercise were spread across the day,    12 in a single bout.

That wasn't   13 news for Aytekin Can, 31, who works at a London financial company, and spends most of his days sitting    14  a computer. Several evenings a week, Can also teaches jiu jitsu, a Japanese martial art  15 wrestling, and also does Thai boxing.

"I'm sure there are some detrimental   16 of staying still for too long, but I hope that being   17 when I can helps," he said. "I wouldn't want to think the sitting could be   18 dangerous."

Still, in a study published last year that tracked more than 17,000 Canadians for about a dozen years, researchers found people who sat   19 had a higher death risk, independently of whether or not they exercised.

Figures from a US survey in 2003-2004 found Americans spend more than half their time sitting, from working at their desks to sitting in cars.

Experts said more research is needed to    20 just how much sitting is dangerous, and what might be possible to offset those effects.

(   ) 1. A. bad                    B. good               C. mean                       D. dead

(   ) 2. A. does                  B. occurs              C. matches                   D. dies

(   ) 3. A. advise                B. talk                 C. suggest                    D. say

(   ) 4. A. thrown                      B. caught              C. seen                        D. published

(   ) 5. A. biological           B. physical           C. psychological           D. logical

(   ) 6. A. commending      B. mending           C. recommending         D. communicating

(   ) 7. A. stand                B. state                C. post                 D. position

(   ) 8. A. harmful             B. careful             C. wonderful         D. skillful

(   ) 9. A. head                  B. arm                  C. body                D. foot

(   ) 10. A. sleep                B. rest                 C. walk                D. exercise

(   ) 11. A. and                  B. so                    C. but                   D. then

(   ) 12. A. rather than              B. other than        C. more than         D. less than

(   ) 13. A. bad                  B. harmful            C. disadvantage     D. welcome

(   ) 14. A. behind             B. back                C. in front of               D. forward

(   ) 15. A. referring          B. involving         C. taking              D. bringing

(   ) 16. A. effects              B. prefects           C. affects              D. offers

(   ) 17. A. inactive            B. active               C. interactive               D. positive

(   ) 18. A. such                 B. little                C. lot                  D. that

(   ) 19. A. less                  B. fewer                     C. more                D. further

(   ) 20. A. leave out          B. bring out         C. hold out           D. figure out

对旺树的修剪原则是（）