题目内容

More and more people like bicycling and it is no surprise. It is fun, healthy and good for the environment. Maybe that’s why there are 1.4 billion bicycles and only 400 million cars on roads worldwide today. Bikes can take you almost anywhere, and there is no oil cost!

Get on a bicycle and ride around your neighborhood. You may discover something new all around you. Stopping and getting off a bike is easier than stopping and getting out of your car.

You can bike to work and benefit from the enjoyable exercise without polluting the environment. You don’t even have to ride all the way. Folding (折叠) bikes work well for people who ride the train. Just fold the bike and take it with you. You can do the same on an airplane. A folding bike can be packed in a suitcase. You can also take a common bike with you when you fly. But be sure to look for information by getting on airline websites. Not all airlines are bicycle-friendly to travellers.

Health Benefits of Bicycling:

It helps to prevent heart diseases.

Bicycling helps to control your weight.

A 15-minute bike ride to and from work three times a week burns off five kilos of fat in a year.

Bicycling can improve your mood (心情).

Exercise like bicycling has been shown to make people feel better, more relaxed and self-confident.

Bicycling is healthier than driving.

1.From the passage, we know that bicycling is becoming very ______ .

A. surprising B. exciting

C. expensive D. popular

2.When you are riding your bicycle around your neighbourhood, you may .

A. pollute the environment around

B. find something you didn’t notice

C. go everywhere and use a little oil

D. get off your bike and begin to work

3.One of the benefits from bicycling is that .

A. you can fold the bicycle

B. you will be friendly to others

C. you will be more relaxed

D. you may get fatter and fatter

4.Which is TRUE according to the passage?

A. Bicycling is enjoyable exercise for people.

B. Driving cars is healthier than riding bikes.

C. Riding a bike pollutes your neighbourhood.

D. Common bikes are welcomed by all airlines.

5. The passage mainly talks about _____

A. Bicycling is healthier than driving.

B. the benefit of cycling

C. the different kinds of bicycle

D. the disadvantages of riding a bicycle

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The relationship between exercise and cancer has long both intrigued and puzzled oncologists and exercise physiologists.

Exercise is strongly associated with lowered risks for many types of cancer. At the same time, exercise involves biological stress, which typically leads to a short-term increase in inflammation(发炎) which can contribute to higher risks for many cancers.

Now, a new study in mice may offer some clues into the exercise-cancer paradox. It suggests that exercise may change how the immune system deals with cancer by boosting adrenaline(肾上腺素), certain immune cells and other chemicals that, together, can reduce the severity of cancer or fight it off altogether.

To try to better understand how exercise can both elevate inflammation and simultaneously protect the body against cancer, scientists at the University of Copenhagen in Denmark and other institutions decided to closely examine what happens inside mice at high risk for the disease.

So, for the new study, they began by gathering a group of adult lab mice. These animals generally like to run.

The scientists then implanted melanoma (黑素瘤) skin cancer cells into the mice before providing half of them with running wheels in their cages while the other animals remained sedentary. After four weeks, far fewer of the runners had developed full-blown melanoma than the sedentary mice and those that had been diagnosed with the disease showed fewer and smaller lesions.

They drew blood from both the exercising and sedentary animals and cells from any tumors in both groups. As expected, they found much higher levels of the hormone adrenaline in the blood of the exercising animals, especially right after they had been working out on the wheels but also at other times of the day. The body releases adrenaline in response to almost any type of stressful experience, including exercise.

They also found higher levels of interleukin-6 in the blood of the runners. This is a substance that is released by working muscles and is believed to both increase and decrease inflammation in the body, depending on where and how it goes to work.

Perhaps most important, they found much higher numbers in the bloodstreams of runners than in the sedentary mice of a type of immune cell named natural killer cells that are known to be strong cancer fighters.

So the scientists repeated their original experiment multiple times, inducing cancer while allowing some mice to run and others to sit. In some of these follow-up experiments, the scientists injected the runners with a substance that blocked the production of adrenaline and gave sedentary animals large doses of added adrenaline.

What they now found was that when running mice could not produce adrenaline, they developed cancer at the same rate as the sedentary animals, while the sedentary animals that had been injected with extra adrenaline fought off their tumors better than other sitting mice.

More remarkably, the scientists determined that adrenaline seemed to be sending biochemical signals to some of the animals’ IL-6 cells, making them physiologically more alert, so that when a tumor began to develop in the affected animal, those IL-6 cells in turn activated the natural killer cells in the bloodstream and actually directed them to the tumors, like minute guide fish.

With these results, “we show that voluntary wheel running in mice can reduce the growth of tumors, and we have identified an exercise-dependent mobilization of natural killer cells as the underlying cause of this protection,” said Pernille Hojman, a researcher at the University of Copenhagen who oversaw the new study. It perhaps provides one more incentive for us to get up and move.

1.In the first experiment, which one is the most important result the scientists found?

A. Natural killer cells are much more in the bloodstreams of runners than in the sedentary mice.

B. Levels of interleukin-6 are higher in the blood of the runners than in the sedentary mice.

C. Exercise such as running seemed to help the mice fight against the cancer.

D. Adrenaline can reduce the severity of cancer or fight it off.

2.In the follow-up experiments, the scientists found ________.

A. the hormone adrenaline has much higher levels in the blood of the exercising animals

B. how these elements in the runners — their increased adrenaline, IL-6, and natural killer immune cells fight against tumor

C. interleukin-6 can both increase and decrease inflammation in the body, depending on where and how it goes to work

D. what happens inside mice at high risk for the disease

3.According to the study, we can infer the fundamental substance to fight the cancer off is ________.

A. adrenalineB. interleukin-6

C. natural killer cellsD. genes

“Beating is a sign of affection, cursing (骂)is a sign of love.”

Many may not expect to hear the words of the old Chinese saying in these modern times—with parents wealthier and better educated than they have ever been—but experts say they still ring true.

Today, it seems, Chinese parents are more likely to send their children to pre?college military academies in the United States in the hope that some tough love will pave the way to success.

“Good education doesn’t mean letting your children enjoy privileges, especially our boys.” said Song Wenming, an entrepreneur (企业家)in Jinhua’ East China’s Zhejiang province. “They should be raised in tough conditions to know what to fight for in the future.”

In August, Song sent his 17?year?old son to Valley Forge Military Academy (VFMA) in Pennsylvania. And he is far from alone, even though it takes a lot of money—around $48,000 per year—to send a child to a strict military school.

Statistics show that an increasing number of Chinese students have been registering with such academies.

A few years ago, there were no Chinese students at Valley Forge. Today, there are 28.“All of the Chinese students at Valley Forge came from wealthy families; some of them were spoiled.” said Jennifer Myers, director of marketing and communications at the school.

Song’s only son, Song Siyu, had a rocky start during his first six weeks at the school. The teenager said he went to the school voluntarily but did not expect it to be as difficult.

Now, three months later, he has perfected the art of taking a bath in 35 seconds, finishing a meal without looking at his food, and making his bed with precision. He can even take criticism, no matter how unreasonable.

“The training is hard but I know it is good for self?development of individuals.” said Song Siyu. “The endless training and scolding are just ways to build up our character; they are not personal.”

But his enthusiasm is not universal. Ten of the 13 Chinese students who joined the academy this year have transferred to other schools.

But for those who stick with it, there is a reward for all the hard work.

1.From the second paragraph, we can know the old Chinese saying ________ .

A. is out of date in modern times

B. is disagreed by rich parents

C. is still worth trusting

D. is deeply believed by better educated parents

2.The underlined sentence means that _________.

A. Song sent his only son to military school,so he feels lonely

B. Song is the only one who sends his child to military school

C. there are other people sending their children to military school besides Song

D. the fee of the military school is so high that only Song can afford it

3.How many Chinese students are there at Valley Forge before this year?

A. 10. B. 13. C. 15. D. 25.

4.Which of the following can be inferred from the passage?

A. It's likely that more and more Chinese students will attend VFMA.

B. Most Chinese parents approve of educating their children by beating and cursing nowadays.

C. Song Siyu had no difficulty in adjusting to the life at VFMA.

D. Most Chinese students support the way of education at VFMA.

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