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

　　A．Being exposed

　　B．Having exposed

　　C．Exposed

　　D．After being exposed

阅读理解

　　Roses are red, but they've never been blue. They are actually a lot of colors, but they lack the right pigment genes(色素基因)that would make them blue.

　　But don't worry, if blue is your favorite color, science has the answer. US scientists have said they could make the missing pigment gene in the near future with developments in biotechnology.

　　The scientists were studying how some medicines affect the liver(肝脏) when they found a human protein that fumed things blue during the process. This may be used to create the world's first - known blue rose.

　　Scientists have already turned a cup full of bacteria (细菌) blue with an enzyme (生化酶) taken from a person's liver. They're now trying to put this same human gene into roses. Technology also promises to make sure the roe still smells good. Commercial growing has led to many beautiful but dull- smelling roses. Their colors are varied and they last a long time, but they've little fragrance.

　　Genetic engineers are also trying to get science to fight diseases and insects that affect the world's 120 different rose kinds. These roses are a US $10 billion-a-year business world-wide. The technology may be very useful in gardening, say scientists. “We could try to grow blue cotton, blue anything really. ”said a scientist..

　　So far, though, it hasn't been easy. They have only managed to get a few blue spots into the stems. “ It's not as easy as you may think. It's going to take more work. ”

　　They're not alone, an Australian company was set up in 1986 to develop a blue rose. Researchers have tried to put a “blue” petunia gene into rose`. But they have not had much success so far.

1．If you like blue roses, you ________.

[　　]

A．can have one in the future

B．can buy one in a shop

C．can never see one

D．can to go to the lab to enjoy them

2．Scientists try to find ________ to make blue roses.

[　　]

A．right human genes

B．a right protein

C．right pigment genes

D．a right enzyme

3．We can infer from the passage that biotechnology will ________.

[　　]

A．make blue roses possible

B．change our life greatly

C．help a lot in gardening

D．make roses smell good