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）
　　Still, in a study published last year that tracked more than 17,000 Canadians for about a dozen years, researchers found people who sat more had a higher death risk, independently of whether or not they exercised.
　　"We don’t have enough evidence yet to say how much sitting is bad," said Peter Katzmarzyk of the Pennington Biomedical Research Center in Baton Rouge, who led the Canadian study. "But it seems the more you can get up and interrupt this sedentary behavior, the better."
　　Figures from a U.S. 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 figure out just how much sitting is dangerous, and what might be possible tooffset those effects.
　　"People should keep exercising because that has a lot of benefits," Ekblom-Bak said. "But when they’re in the office, they should try to interrupt sitting as often as possible," she said.
【小题1】What is the best title for the text?

D

As school fl,tats again，there’s SO much mole for an American parent to nag(唠叨)about，like

homework，bedtime and lost hours on the Intemet．But in the age of digital childhood，Jacky Long-well，45，of McLean，Virginia，often text—messages(发短信)what she OnCe told her children bymouth_"Be nice to your brother；walk the dog；remember your reading．

This is the world of the modem family，in which even reminding children to do something has

become electronic．

There  are changes in how parents nag and in what they nag about and in the frequency of their

nagging．

With technology，“you nag more，and you are a little bit more：precise with your nagging．’’said

Reginald  Black，46，of Woodbridge，Virginia．

For many young people，electronic nagging is part of the experience of growing up．Charles Flowers，17，131．$enior at St．John“College High School in Washington．says his mothel-reminds him about everything from laundry，being Oil time to baseball practice and mowing the lawn by text．

When she uses capitals he knows she is serious：GET HOME!

Some say technology has made nagging less annoying．

Jaeky Longwell thinks texts ale less emotional than spoken messages and less likely to be resisted by teenagers．

It’s not as painful for them to hear it by text．It becomes grouped with the friendly communication，”she said．“They can’t hear the nagging．”

She thinks a good way to do it is to mix friendliness with nagging．A parent Call always start by

saying hello．

Not all parents like the new electronic r,agging．Joyce Bouehard，51，a mother of four in Fairfax，Virginia，texts her 14一year—old son but says that for many  things — chores，homework— the

old—fashioned way works better．Nagging by text has risks，she notes：I always think，if you are texting them something and they are with their friends，they ale getting a big laugh out of it．’’

68．We can conclude from the first two paragraphs that————————．

A．American children often stay up late studying

B．Jacky Long'well had a happy aigital childhood

C．American parents pay too much attention to their children’s studies

D．American parents think a lot about their children’s characters

69．The example of Reginald Black is used to show readers————————．

A．that her nagging is thoughtful

B．how the amount and kind of nagging have changed with the arrival of the digital age

C．the kind of skills a parent needs to nag effectively

D．that she likes nagging her children very much

70．We can infer that—————————．

A．It’S better for parents to nag in a friendly,way

B．whether、nagging is e]ectronic or not，it is annoying

C．American parents generally don’t like to nag

D．American parents like to llse capital letters in messages

7 1．The main idea of the article is———————一．

A．the subjects American parents like to nag about

B．the reaSOliS American parents like to nag their children

C．that electronic nagging is becoming commoll in the U．S

D．how American parents began to nag their children by text messages

下面短文中有10处语言错误。请在有错误的地方增加，删除或修改某个单词。

  增加：在缺词处加一个漏字符号（^），并在其下面写上该加的词。

  删除：把多余的词用斜线（\）划掉。

  修改：在错的词下面划一横线（_），并在该词下面写上修改后的词。

  注意：1  每处错误及其修改均仅限一词；

2     只允许修改10处，多者（从第11处起）不计分。k*s5*u

Dear Jin Jing,

    Your problem is common one among middle school students. Maybe the following advices can help you. First in all, believe in yourself. Your greatest problem is that you don’t have self-confidence. The first thing you must do is to smile at your classmates. One smile speaks loud about your wish to make the friends than any word. Your smile will show that you are friendly to him. Next, trying talking with a student who is as shy as you or who share the same interest with you. You can discuss your studies with a classmate, and you can also talk about your hobbies as well. Unless someone is in trouble, you should be ready to help him or her. Once you have confidence, you can make as many friends as possibly．

                                                                                                             Yours，

                                                                                                               Lily