阅读下列短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项。

    There are many useful suggestions that can help one to improve English. Here are some of them to increase one's English language vocabulary.

    Learning English vocabulary is about much more than just learning the right words. It is based on understanding important words and expressions.

    Learning a word will not help very much if you quickly forget it. Researches show that it takes from 10 to 20 repetitions(重复) to really make a word part of your vocabulary. Since most words are learned from how they are used in context (上下文), the more words one is shown, the better vocabulary one will have. Keep a piece of paper close to you. When you read, pay close attention to the word you do not know, write the word down and try to understand its meaning from the context. Then look up the word in a dictionary. 

    Remember that if you do not use English words that you have just learned in conversation or writing, you will forget them very quickly. So the best way to learn new words effectively is just by trying to use them in conversation and writing. Remember also that practice is the key to fluent spoken English.

    Building vocabulary is a life-long task. Remember: ＂In the beginning was the word.＂ Your future could depend on how rich your vocabulary is. It will also determine the quality of your communication.

    Optimism May Help People Live Longer

People who have an optimistic view on life are more likely to live longer, a US study said Wednesday.

    The study, published in the American Journal of Epidemiology, analyzed data from 2004 to 2012 from 70,000 women enrolled in the Nurses' Health Study, a long-running US study tracking women's health via surveys every two years.

    The researchers looked at participants' levels of optimism and other factors that might play a role in how optimism may affect mortality risk, such as race, high blood pressure, diet, and physical activity.

    It found the most optimistic women, or the top 25%, had a nearly 30 percent lower risk of dying from any of the diseases analyzed in the study compared with the least optimistic women, or the bottom 25%.

    The most optimistic women had a 16 percent lower risk of dying from cancer; 38 percent lower risk of dying from heart disease; 39 percent lower risk of dying from stroke; 38 percent lower risk of dying from respiratory disease; and 52 percent lower risk of dying from infection.

    Previous studies have linked optimism with reduced risk of early death from cardiovascular (心脑血管的) problems, but this was the first to find a link between optimism and reduced risk from other major causes.

    “While most medical and public health efforts today focus on reducing risk factors for diseases, evidence has been mounting that enhancing psychological resilience (弹性，复原力) may also make a difference,” said Eric Kim, research fellow at the Harvard T.H. Chan School of Public Health and co-lead author of the study.

    “Our new findings suggest that we should make efforts to boost optimism, which has been shown to be associated with healthier behaviors and healthier ways of coping with life challenges.”

    The study also found that healthy behaviors only partially explain the link between optimism and reduced mortality risk. One other possibility is that higher optimism directly affects our biological systems, Kim said.

    Co-lead author and postdoctoral research fellow Kaitlin Hagan said optimism can be varied with relatively uncomplicated and low-cost interventions (干预), even things as simple as having people write down and think about the best possible outcomes for various areas of their lives, such as careers or friendships.

    “Encouraging use of these interventions could be an innovative way to enhance health in the future,” Hagan said.

    We know that many animals do not stay in one place. Birds, fish and other animals move from one place to another at a certain time. They move for different reasons: most of them move to find food more easily, but others move to get away from places that are too crowded.

    When cold weather comes, many birds move to warmer places to find food. Some fishes give birth in warm water and move to cold water to feed. The most famous migration(迁移) is probably the migration of the fish, which is called “salmon”. This fish is born in fresh water but it travels many miles to salt water. There it spends its life. When it is old, it returns to its birthplace in fresh water. Then it gives birth and dies there. In northern Europe, there is a kind of mouse. They leave their mountain homes when they become too crowded. They move down to the low land. Sometimes they move all the way to the seaside, and many of them are killed when they fall into the sea.

    Recently, scientists have studied the migration of a kind of lobster(龙虾). Every year, when the season of bad weather arrives, the lobster get into a long line and start to walk across the floor of the ocean. Nobody knows why they do this, and nobody knows where they go.

    So, sometimes we know why humans and animals move from one place to another, but at other times we don't. Maybe living things just like travel.

    Everyone who has eaten instant noodles knows that it's very easy to cook them quickly. However, have you ever heard of the danger of eating them?

    When taking out the noodles from the packaging, you will notice that they are joined together nicely as a piece. Do you know that it needs some form of wax coating (蜡涂层) to make them joined together nicely? Many people don't really care much about it because this seems very normal. However, studies have shown that the wax coating is bad for our body.

    It is advisable to have a break of 2-3 days before we start to eat another packet of instant noodles because our body needs about 3 days to clear that wax coating away. Do you know the danger of having too much wax coating in our stomach? It will lead to cancer if it is in our body for so long.

    Luckily, there is a way of reducing the danger before we eat instant noodles. First, wash the noodles with warm water, stir (搅拌) them and pour away the water containing the wax coating. Then repeat the first step and try to stir them again to wash away the wax coating on the noodles before cooking them. The shop vendors (供应商) will often wash away the dangerous wax coating.

    It is very easy to cook instant noodles but we must pay attention to the wax coating if we eat too much. Imagine having too much of it in your stomach. Oh, my! Hope this article will help more people know about the hidden danger!

Dear Mom,

    I haven't written before for quite a while because I have got no energy. I now get around my room and this floor of the hospital with a walking stick but I can go only a little bit at a time because I'm awfully weak yet. My right leg was taken out of the cast (石膏) several days ago and it's still as stiff as a board and awfully sore from so much carving around the knee joint. But the surgeon says that eventually it will be all right. I've included a picture of me in bed. It looks like my left leg is a stump (残肢), but it really isn't. Just bent so it looks that way...

    This war makes us a bit less fools than we were. There isn't going to be any such thing as "foreigners" for me after the war is won. I've gotten Italian pretty well. I've picked up quite a lot of Polish and my French is improving. You want to be prepared for a lot of visitors after the war now because I've a lot of pals coming to see me in Chicago. I don't know when I'll be back. I can't get in the army and they won't take me with two shaky legs in the draft (征兵) if I go home. So I might as well stay over here and avoid the awkwardness for a while.

    Also Ma, I'm in love again. Now don't start worrying about me getting married for I'm not. I'm not even going to get engaged. So don't write any "God Bless U, My Children": Not for about 10 years. You're a dear old kid, and still my best girl. God bless you and write me often... I love you.

Ernie

    At 1,345 meters above sea level, Ben Nevis is not the world's most difficult mountain to climb. But things get considerably tricky if instead of hiking shoes you put on a pair of 5-inch high heels, especially if you're a guy. One English teenager recently proved that it was not impossible.

    Ben Conway, a 19-year-old art student from London, recently took up the challenge as a way to stand out in an application for a scholarship for the School of Communication Arts in Brixton. He started his unusual high-heel climb at 8 a.m., on June 27, and was joined by Callum MacKenzie Allen, a friend from his art foundation year, who videotaped the whole thing for a two-minute video that was used as his application project. The whole climb took five hours and wasn't the smoothest experience.

    Halfway up Ben Nevis, one of his shoes broke, so he had to tape the shoes to his feet to make sure they stayed on. The weather didn't make it easy for him either, as he claimed that it rained pretty much the whole time, and he had to go against 40 to 50 miles an hour winds. Due to these difficult conditions, Ben and his friend had to turn back after reaching 900 meters up the mountain.

    Besides providing a unique art school application project, the high-heel climb also allowed the 19-year-old to raise some money for worthy causes (事业), like Sal's Shoes, which provides footwear for barefoot children around the world.

    "Raising money for charity brings happiness to people's lives and if I can do something ridiculous and bring someone happiness, then that's what it's all about." Ben said.