What is the most stressful (有压力的) thing in school? It is probably exams. Exams can put us under a lot of stress. But some students do better under stress, while others do not. So, why do some students behave better under stress?

    It all comes down to dopamine (多巴胺). Dopamine is a chemical in our body that sends signals in the brain. It has many important roles: influencing memory, attention and how we learn.

    Our brains work best when there is a balance (平衡) of dopamine—not too much or too little. Our brains control dopamine in two ways. It either takes out dopamine quickly, or bit by bit. Exam success can be connected to how fast dopamine goes back to a balance, according to new research from the University of Missouri, reported Yahoo.

    What happens when we take an exam? If you become stressed, your brain will start to overload on dopamine. It is like a cup overflowing with water. The quicker you are able to go back to a balance of dopamine, the quicker you can focus, helping you do better on a test.

    Scientists found that, during a test, people who slowly got back to a balance of dopamine scored 8 percent lower. That's the difference between a good mark and a bad mark.

    But don't fear, there is good news for every student. The study also found that the more practice you get, the less stressed you will be. So, it turns out that     .

    We sometimes call the lion "the king of the forest", because it is stronger and more dangerous than other animals. It can 1 faster than many animals and hunt the best. It is the highest animal in the 2 food chain.

    In the sea, the shark is one of the animals at the top of the food chain. It can swim faster than 3 other sea animals, and it can use its big teeth to eat them.

    What is at the top of the world's food chain? People are! We are not the biggest or fastest, but we are the 4. We could not run faster than cheetahs(猎豹), so we 5 cars and now we can move the fastest. We could not fight better than lions, so we invented guns. Now we can hunt the best.

    People's inventions are clever, but they can be 6, too. For example, people built 7, and now they make the air and rivers dirty. This can make terrible changes. Dirty rivers kill fish. 8 bears cannot eat the fish. If we kill one part of the food chain, other parts also will die. Remember that we are a part of the food chain, 9 we are in danger, too! If we protect animals, we are protecting 10! We could and we should do something for the world!

How to keep on your exercise plan during winter? Here I'll give you some suggestions.

To stay active during the winter, you should first make it as easy as possible to do your exercise. Second, make something different before you {#blank#}1{#/blank#}doing exercise. The following advice will give you some ideas for making winter exercise more comfortable and more enjoyable.

Put your sports clothes in the dryer. If you want to exercise outside, you might keep the clothes in the dryer for a few minutes before that. It's often harder to {#blank#}2{#/blank#}when it's cold outside. {#blank#}3{#/blank#}clothes fresh from the dryer is just one way to get your body warm.

Take a hot shower. If it's really cold outside, you might even try a quick shower to get yourself warm before you do exercise.

Walk indoors. Walking is a good way to {#blank#}4{#/blank#}. To get out of cold weather of winter, you can simply walk indoors, probably in the living area of your room. Walking indoors makes you {#blank#}5{#/blank#}and gives a warm temperature to do it.

People love walking through a giant puzzle. In a corn maze(玉米迷宫), they can follow miles of paths and run into lots of dead ends before they finally find their way out. The corn maze has been growing for almost 30 years. 

Simple corn mazes began appearing in the 1980s. In 1993, the first big corn maze created for the public to enjoy was made in Annville Pennsylvania, by Don Frantz and Adrian Fischer. Then, in a corntield as big as two and a half football fields, Mr. Frantz created "The Amazing Maize Maze"with the help of his family and friends. When it was done, almost two miles of pathways snaked through the cornfield. Since then, thousands of corn mazes have been created around the world.

For many farmers, a corn maze means a boost(激增) of extra income. During the opening weekend, about 6, 000 visitors came to get lost in Mr. Frantz's maze. Charging only $5 per person, he earned almost $32, 000in two weeks.

Brett Herbst is also a maze designer. In 1999 he set a world record for the world's largest corn maze, an image of the solar system with nine planets in it. He now has a business called The Maize, which has designed more than 4, 000 mazes around the world. "Corn mazes help people connectwith their roots, "he says. "People are so far removed from farm life that they are drawn to something real, something organic. "

Today, a great number of people enjoy seeking fun in a corn maze. Mr. Herbst says, "When we see families on the farm having fun, we know that they are making memories that will last a lifetime. "

Bangkok is the capital of Thailand. And it is also a city full of special {#blank#}1{#/blank#}(风景；名胜). The tall glass shopping centres in the city look very modern. But behind them is a place where life has {#blank#}2{#/blank#}(几乎没) changed for over 100 years—the canals(运河), which can date back to 178 These canals are home to many Thai people who {#blank#}3{#/blank#}(从不) leave there.

There are four markets on the canals around Bangkok, and the {#blank#}4{#/blank#}(最古老的) and most popular one is in the town of Damonen Saduak. This market {#blank#}5{#/blank#}(开) at 6:30am every day. People get there {#blank#}6{#/blank#}(早)by water taxi.

It's a noisy but wonderful place. Ladies sit in small boats, filled with {#blank#}7{#/blank#}(新鲜的)fruit and vegetables for sale. But the boats don't just sell food. Would you like a silk necktie? A traditional hat? Then just call and{#blank#}8{#/blank#} (指;指向) at them.

After the noise and excitement of the markets, continue {#blank#}9{#/blank#}(沿着) the canal. Soon you'll see many wooden houses and colourful flowers and hear lovely birds {#blank#}10{#/blank#}(唱歌) in the fruit trees. It's a peaceful way to finish your trip.

Every week, I get emails about how to learn English very fast. Someone1 to ask how they can speak excellent English in a short time. And someone writes to ask how to improve their English listening2 .Is it possible to learn English very fast? The answer is yes.3 of course, to make great progress, you need to work very hard.4 first and most important thing you need to have is passion (热情).Why? Because you must study English for 8-14 hours a day and you must be more5 . To improve your English quickly，you must build passion(热情). Remember, passion is 80% of success. The second key to super-fast learning is English input（输入）.You6 spend lots of time listening and reading. It's a good idea7 your radio everywhere. Don't forget to have a book with8 . You should listen to the Mini-Story Lessons and read easy English stories—starting9 books for children. These are my ways of learning English. In fact，most people do not need to improve so fast. Two hours a day of listening and reading10 OK. Good luck!