第二节：完形填空（共20小题；每小题1．5分，满分30分）
阅读下面短文，掌握其大意，然后从各题所给的四个选项中，选出最佳选项。
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   36  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   37  ．
Research is preliminary, but several studies   38  people who spend most of their days sitting are more likely to be fat, have a heart attack or even die．
In an editorial   39  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   40  activity to highlight the dangers of sitting．
While health officials have issued guidelines   41  minimum amounts of physical activity, they haven't suggested people try to limit how much time they spend in a seated   42 ．
"After four hours of sitting, the body starts to send   43  signals," Ekblom-Bak said．She explained that genes regulating the amount of glucoseand fat in the   44  start to shut down．
Even for people who   45   , 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 —   46  still spend a lot of time sitting — might get more benefit if that exercise were spread across the day,    47  in a single bout．
That wasn't   48  news for Aytekin Can, 31, who works at a London financial company, and spends most of his days sitting    49   a computer．Several evenings a week, Can also teaches jiu jitsu, a Japanese martial art  50  wrestling, and also does Thai boxing．
"I'm sure there are some detrimental   51  of staying still for too long, but I hope that being   52  when I can helps," he said．"I wouldn't want to think the sitting could be   53  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   54  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    55  just how much sitting is dangerous, and what might be possible to offset those effects．
36．A．bad         B．good        C．mean              D．dead
37．A．does           B．occurs      C．matches           D．dies
38．A．advise         B．talk     C．suggest           D．say
39．A．thrown       B．caught     C．seen                D．published
40．A．biological       B．physical   C．psychological     D．logical
41．A．commending   B．mending C．recommending        D．communicating
42．A．stand          B．state           C．post             D．position
43．A．harmful      B．careful     C．wonderful          D．skillful
44．A．head           B．arm     C．body               D．foot
45．A．sleep          B．rest      C．walk               D．exercise
46．A．and         B．so        C．but              D．then
47．A．rather than      B．other than C．more than         D．less than
48．A．bad         B．harmful   C．disadvantage       D．welcome
49．A．behind        B．back        C．in front of          D．forward
50．A．referring     B．involving C．taking              D．bringing
51．A．effects        B．prefects    C．affects            D．offers
52．A．inactive      B．active      C．interactive          D．positive
53．A．such           B．little        C．lot               D．that
54．A．less         B．fewer       C．more              D．further
55．A．leave out     B．bring out C．hold out          D．figure out