Read the following article and select the best answer. Article: This US competition is for camping related articles in which you share your tips, advice, experience, etc. Closing: When we've received 100 articles -- so you'd better be quick. Prizes: $100,$75,$25 -- all in VISA Gift Cards. How to enter our writing competition In your own words, write an article on a camping topic such as: how to's, reviews, tips and advice, or any topic camping related.The best articles will include useful information about camping, in an interesting and well-written way.Remember that it should be no less than 200 words. Other requirements 1.Fill in all the information required, including your article, on our webpage CampTrip.com and then submit it. 2.You must be 16 years old or over to take part in the competition. 3.You must be a student who is now studying in the US. And what's in it for you? We are giving out a VISA Gift Card for first, second and third best articles.Simply share your experience with others and try to win a VISA cash card.The writing competition is limited to 100 articles which gives you a better chance of writing.So why don't you take up this chance? Question: If you want to enter for the competition, _ . - you should write something useful - you must be a US student who is under 16 - you'd better write a short introduction of yourself - you must send your information to an e-mail address
you should write something useful

Read the following article and select the best answer. Article: Smart Exercise Doctors are starting to find more and more information that suggests a connection between exercise and brain development. Judy Cameron, a scientist at Oregon Health and prefix = st1 /ScienceUniversity, studies brain development. According to her research, it seems that exercise can make blood vessels, including those in the brain, stronger and more fully developed. Dr. Cameron claims this allows people who exercise to concentrate better. As she says: "While we already know that exercise is good for the heart, exercise can literally cause physical changes in the brain." The effects of exercise on brain development can even be seen in babies. Babies who do activities that require a lot of movement and physical activity show greater brain development than babies who are less physically active. With babies, even a little movement can show big results. Margaret Barnes, a pediatrician , believes in the importance of exercise. She thinks that many learning disabilities that children have in elementary school or high school can be traced back to a lack of movement as babies. "Babies need movement that stimulates their five senses. They need to establish a connection between motion and memory. In this way, as they get older, children will begin to associate physical activity with higher learning," says Margaret. Older people can beef uptheir brains as well.CornellUniversitystudied a group of seniors ranging in age from seventy to seventy-nine. Their study showed a short-term memory increase of up to 40 percent after exercising just three hours a week. The exercise does not have to be very difficult, but it does have to increase the heart rate. Also, just like the motion for infants, exercise for older people should involve some complexity. Learning some new skills or motions helps to open up memory paths in the brain that may not have been used for a long time. For most people, any type of physical activity that increases the heart rate is helpful. The main goal is to increase the brain's flow of... Question: Margaret Barnes thinks that a lack of movement in infancy can - lead to learning troubles later. - cause physical disabilities later. - stimulate the five senses. - bring about changes in the brain.
lead to learning troubles later.

Q: Read the following article and select the best answer. Article: I learned about life from an ant farm.When I was seven years old, my family created one.First, we put clean sand in a thin glass box, and then we waited for the live ants to arrive.Shortly after the chilly ants were dropped into the glass structure, they got to work making tunnels.I was amazed that each one knew exactly what to do.After hours of staring, I realized that the ants had assigned jobs.With my mom ' s help, I kept a diary of what happened each day and named the ants. One day a tragedy struck the ant farm.The pages of the diary, still wrinkled where tear drops fell, indicate the depth of the tragedy.'I had put my face so close to the structure that I accidentally tipped it over, caving in all the tunnels.Although the ants survived their earthquake, one by one they began to die.I was terrified as I watched them give up their tunnel-building to carry the bodies to a comer of the farm.My mother reported that the ants were dying of "frustration." They simply could not stand the reality that their tunnels had been destroyed. Although much time has passed, I still think of that ant farm.Mom had hoped it would teach me about the natural world, but it taught me much more.Over the years, I came to realize the ants were a study in the benefits of teamwork.Working together, they were able to create an amazing world for themselves.I also learned that they should be admired for their hard work.Day in and day out, each labored at their task.The ant farm showed that teamwork and perseverance are indeed two key ingredients to success.But there was an even larger lesson that I did not realize until recently: Adversity (, ) is a natural part of life,and must be accepted.Unlike the ants, humans cannot give up when they face disappointment.Unlike the ants, we have to realize that if a tunnel caves in, we just have to build another.Giving up, I say, is not a choice. Question: What made the pages of the diary wrinkled? - The tears. - The earthquake - The ants. - The tragedy.
A: The tears.

Q: Read the following article and select the best answer. Article: Even if we have an extremely healthy diet and lifestyle, the human body is programmed to wear out at a maximum of about 120 years, and usually less. We all have a biological clock inside us which determines the moment when our organs cease to function properly. This is because our cells have stopped renewing themselves and our body can no longer repair itself. This is also the moment when we are more likely to begin to suffer from the diseases of old age such as arthritis and Alzheimer's. However, rapid advances in DNA research are beginning to throw light on the secrets of the ageing process. By the end of this century we could literally have the power of life over death. Although it has long been accepted that humans have a fixed lifespan, it is also a fact that certain other organisms, such as reptiles and amphibians, appear to _ . The only reason we do not see 500-year-old alligators is because in the wild their lives are always in danger, from man, from pollution and from other animals. When they are kept in zoos they do not seem to age at all after they are fully grown. The same is true of some species of fish, which grow indefinitely and show no signs of ageing. The existence of animals with no fixed lifespan seems to indicate that an age gene really does exist. It is this gene which scientists are searching for, which may delay or repair damage to the body caused by ageing. Another new area of research involves the oxidation theory, which says that ageing is caused by the same process that makes iron rust. In controlled experiments, the lifespans of certain animals were shown to be lengthened with anti-oxidants; for example, the lifespan of mice can be increased by 30%. Antioxidants are already being used in face creams and other cosmetics, and they are likely to play an important part in keeping people physically young. Perhaps the most immediate advance we are likely to see in the battle to halt the ageing process will be organ replacement. By the year 2020 it is likely that we will be replacing... Question: When all humans reach a certain age, _ . - they suffer the effects of their diet and lifestyle - the organs stop to perform appropriately - their cells continue to renew themselves - they develop arthritis and Alzheimer's
A: the organs stop to perform appropriately