4.  According to the text , the author intends to tell us that _____________________.

A. Sleeping a little bit longer a day might help fight against obesity

B. insufficient sleep is linked with changes in hormone lives

C. there exists a clear link between the risk of being obeses and hours of nightly sleep

D. the less people sleep , the heavier they tend to be

                     B

Like a scene out of a reality show or a Disney movie, Southgate, Mich., teenager Ashley Qualls' moment has arrived.

She may not have an MBA, a high-school diploma, or even a driver’s license yet, but Asheley Qualls already has an influential website (). The 17-year-old girl hass been building her online business for two years.

In December 2004, Qualls borrowed $. domain name (域名). She intended to use the website as a way to share her design for My Space pages woth her friends.

But in the incontrollable, fast-moving world of cyberspace, others began noticing Qualls’ site even though she never has spent a penny on advertising.

When it comes to web traffic, .currently ranks No. 825 out of 20.3 million websites, drawing 2.4 million visitors worldwide during the last 30 days. Qualls said that on average, 72% of her site's audience made a return visit.

earned a million dollars in revenue last year and is on track to do the same this year.

"I'm stubborn and I'm independent," she said from her office in the basement of her house. "I like the feeling that it's my company, and I want to have the say-so ( 主张)in everything."

But don’t mistake Qualls for another smart but spoiled teenager. She is growing up fast but owns talent for life and business that elude many girls of her age.

The task of running a million-dollar company isn’t without its sacrifices( 牺牲), a decision that she said shocked her family, friends and teachers . She now is studying to get her degree in graphic design.

8. A suggested measure to be taken to reduce teenagers' driving accidents is that ________ .

A. driving in the presence of an adult should be made a rule

B. they should be prohibited from taking on passengers

C. they should not be allowed to drive after 10 p.m.

D. the licensing system should be improved

第11天                A

BEIJING, Jan. 11(Xinhuanet)-- Sleeping a little bit longer a day might help fight against obesity(肥胖), a recent study shows. The research-- published in the Archives of Internal Medicine along with an editorial by Turek and Northwestern colleague Joseph Bass commenting on it and related research-- after comparing people of normal weight- a body mass index of less than 25- with those who were overweight or obese , found that sleeping for an extra 20 minutes each night could offer a pain-free way to lose weight.

Insufficient sleep is linked with changes in hormone levels that may stimulate(刺激)appetite. A series of studies in recent months have shown that the less people sleep, the heavier they tend to be.

American researcher Robert Vorona from Eastern Virginia Medical School in Norfolk and colleagues have now examined the relationship between people's self-reported sleep time per 24 hours and their body mass index(BMI). They found that total sleep time and BMI were inversely correlated was total sleep time decreased, BMI increased, except in the severely obese group." Americans experience insufficient sleep and corpulent bodies. Clinicians are aware of the burden of obesity on patients," the study said. "Our findings suggest that major extensions of sleep time may not be necessary, as an extra 20 minutes of sleep per night seems to be associated with a lower body mass index," it added. "We warn that this study does not establish a cause-and-effect relationship between restricted sleep and obesity (but) investigations demonstrating success in weight loss via extensions of sleep would help greatly to establish such a relationship."

In November 2004, researchers from Columbia University in New York City, New York demonstrated a clear link between the risk of being obese and hours of nightly sleep, finding that people aged 32 to 59 who slept four hours or less per night were 73% more likely to be obese than people who slept between seven and nine hours per night.

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