New research suggests that cutting daily sitting time to less than three hours might extend your life by two years.

   “Humans were designed to move. But modern lifestyles and office jobs rarely encourage us to walk around,” says Peter Katzmarzyk, an expert at the University of Louisiana.

   “Sitting is common in our lives today. We sit while we’re driving, eating and watching TV. And many of us sit for many hours at work.” Katzmarzyk said.

   “We can’t throw away physical activity. It’s extremely important. We have 60 years of researchers showing us that.” Katzmarzyk said.

   Katzmarzyk and other researchers are trying to discover how sitting all day affext our lifespans（壽命）.

   “This is a relatively new area of study…Studies that have assessed the relationship between sitting and death or television viewing and death have been very rare in the last four or five years,” said Katzmarzyk.

   Katzmarzyk and his colleagues analyzed data from these studies, which involved almost 167,000 adults. Then they turned to a government-run survey of Americans to find out exactly how much time people spend sitting and watching.

   Not only did the team find that U.S. citizens could live longer by sitting less, they found that cutting TV time to less than two hours a day could add an extra 1.4 years to their lives.

People who’ve spent half their waking lives sitting down might well ask, “Is it ever too late to make a change?”

“We would say ‘No. It’s never too late.’ Physical activity is good for you at every age.” Katzmarzyk said.

Katzmarzyk says studying this problem has inspired his team to make a few changes in their own lives. They recommend a few simple changes: frequently getting up from your desk, taking walks at lunch time, and instead of e-mailing colleagues, walking over to their offices and talking face-to-face——all activities that can be enjoyable as well as life-extending.

1.Peter Katzmarzyk seems to believe that _____.

A. we should not sit for a long time   

B. most people like to sit most of the time

C. office jobs encourage us to walk a lot  

D. modern lifestyles are good for our health

2.The underlined word “that” in paragraph 4 probably refers to _____.

A. taking physical exercise is important  

B. many researches should be carried out

C. we should exercise during working hours

D. people should focus on their health at work

3.Why did Katzmarzyk and his colleagues turn to a government-run survey?

A. To collect information for the government

B. To know how long people sit and watch TV

C. To find what citizens do in their spare time’

D. To discover how sitting for long affects their lives

4.The best title of the text would be _____.

A. What Is the Healthiest Lifestyle？

B. Sitting for a Long Time Is Bad for Us

C. Study Suggests Sitting Less Can Extend Life

D. It Is Never Too Late to Change Our Way of Life

We know the effect calories have on your body．For each pound of weight that your body carries，it takes about 12 calories per pound per day to keep it alive．If you weigh 150 pounds，you therefore need about(150X 12)1，800 calories per day to keep yourself alive and maintain that same weight．

If you were to eat more than 1，800 calories per day，the extra turns into fat．

It takes about 3，600 calories to make a pound of fat．

The graph below shows your eating pattern before，during and after the diet．

Note that the graph assumes that you，like most people，eat any number of calories per day．Some days you are“good”and eat less，and some days you are“bad”and eat more，but the assumption is that it averages out to 2，000 calories per day over the long run．

The diet really takes the weight off．

But the weight comes right back when you

return to your“normal”eating pattern．

The weight appears to come back so

quickly because when you are at your

lightest。you tend to gain more weight each

day．The lighter you are，the fewer calories

you need．If you only need l，500 calories

per day and you’re eating 2，000，you’re going to gain weight faster than if you need

1，800 and you’re eating 2，000．

 There are only two ways to keep the weight off：

?Change your overall eating pattern so that you take in，on average，fewer calories than before you went on the diet．

?Start exercising so that you“burn”the extra calories you take in．

?The best course of action is a combination of these two choices．

64．Which of the questions does the passage answer?

A．Why does the weight come back so quickly once one stops dieting?

B．Why does calorie play so important a part in keeping fit?

C．Why do some people get fatter in the modern society?

D．Why do people need to burn calories every day?

65．How will a person become if there is calorie more than needed?

A．He might feel sick．                                   B．He might gain weight．

C．He must see a doctor at once．                   D．He w0111d eat more than he can．

66．Who might get heavy more quickly if they eat 2500 calories per day?

A．A woman of 167 pounds．                          B．A man of 157 pounds．

C．A man of 147 pounds．                              D．A woman of 160 pounds．

67．Which of the following statements will the author NOT agree to according to the passage?

A．People don’t have to diet because once they stop，they will gain weight．

B．People’s weight can determine the amount of calories needed．

C．Dieting people can exercise more and take in less calories in the long run．

D．Thin people hoping to get weight don’t have to go on dieting．