Keeping a busy social life among lots of friends may keep people thinner than spending hours doing some exercises, according to scientists. They say that socializing and meeting with friends help increase levels of brown fat in the body which burns calories to produce heat.
Living in an exciting social environment was found to reduce fat in mice's belly by half over four weeks, even if they ate more. US researchers say that social excitement aids weight loss by turning white fat into brown. White fat stores calories and makes us fatter, while brown burns energy to produce heat. Turning white fat into brown is extremely difficult, normally requiring long- term stay in cold conditions or exciting part of the body's nervous system.
However, scientists from Ohio State University now think that having a busy social life is an even more effective way of changing white fat into brown. The team came up with their theory by studying the effects of various living environments on mice. Those, who lived alongside a greater number of mice, had more space and toys to excite themselves and then lost far more weight over the course of the study than their “couch potato" fellows.
Study author, Dr Matthew During, whose team's findings appear in the journal Cell Metabolism, said, "I'm still amazed at the degree of fat loss that occurs." Explaining how new technology had threatened face-to-face socializing, he added, "It's not just a sedentary(久坐的) lifestyle and high calorie foods, but an increasing lack of social activities." Co-author Dr Lei Cao said，"Loneliness is a potential factor for cancer and death; it's equal to cigarette smoking to a certain extent. Social activities are very vital. What information can we get from the first two paragraphs?
| A．Brown fat stores calories and makes us fatter |
| B．It doesn't take long to turn white fat into brown. |
| C．Social excitement helps gain more weight |
| D．Brown fat can burn energy to produce heat. |
Which of the following statement does the text support?
| A．Levels of brown fat can be increased by socializing. |
| B．The mice lacking social life lose more weight. |
| C．The research findings haven't been published so far. |
| D．Dr Matthew During wasn't convinced of the result. |
We can conclude from the text that _______.
| A．the fat in mice's belly was reduced because of the relaxing environment |
| B．a sedentary lifestyle and high calories foods influence people's social life |
| C．surfing the Internet may influence people's face-to-face communication |
| D．cancer and death are mainly caused for lack of social life |
What’s the main idea of the text?
| A．Brown fat is beneficial to people's health. |
| B．Socializing is unnecessarily important in people's daily life. |
| C．White fat can be changed into brown fat. |
| D．Socializing contributes to people's losing weight. |
Life on land probably began about 430 million years ago, though it has existed in the water for perhaps as much as 3,000 million years. When we think of the first thing on land, we probably think of strange animals coming out of the oceans, but in fact no animals could have been living if plants had not been on land first. Plants had to be on land before animals arrived. They supplied the first land animals with the surrounding and food necessity, since they, the plants, are the only form of life that is able to get and store energy.
The first plants to exist out of the water were probably certain kinds of algae（海藻）which were followed by other plants that grew close to the ground and needed water in which to reproduce. Once the move to land had been made, however, evolution（进化）took place quickly. By the end of 100 million years, plants had developed their roots（根）,and some had got tree -like forms since height was very important in gaining sunlight. About 300 million years ago, much of the world was covered with forests of huge trees. In most ways they were like modern trees. They had roots, leaves, wood, but mostly they had not developed seeds.The main idea of the first paragraph is ________.
| A．life on land probably began 430 years ago |
| B．the first animal on land came from oceans |
| C．there wouldn't be animals without plants |
| D．plants are the only form of life that is able to get and store energy |
Which of the following statements is true according to the passage?
| A．Algae has existed for more than 430 million years. |
| B．It is impossible that algae might be the earliest plant on land. |
| C．Plants get food from animals in the oceans. |
| D．Evolution began after animals appeared on land. |
Plants with roots appeared about ________ million years ago.
| A．430 | B．300 | C．330 | D．100 |
According to the passage, ________ appeared earlier than ________.
| A．apples; oranges | B．oranges; apples |
| C．oranges; roses | D．algae; wheat |
Artificial(假的) flowers are used for scientific as well as for decorative purposes. They are made from a variety of materials, such as wax and glass, so skillfully that they can scarcely be distinguished from natural flowers. In making such models, painstaking and artistry are called for, as well as thorough knowledge of plant structure. The collection of glass flowers in the Botanical Museum of Harvard University is the most famous in North America and is widely known throughout the scientific world. In all, there are several thousand models in colored glass, the work of two artist-naturalists, Leopold Blaschka and his son Rudolph.
The intention was to have the collection represent at least one member of each flower family native to the United States. Although it was never completed. It contains more than seven hundred species representing 164 families of flowering plants, a group of fruits showing the effect of fungus diseases, and thousands of flower parts and magnified details. Every detail of these is accurately reproduced in color and structure. The models are kept in locked cases as they are too valuable and fragile for classroom use.Which of the following is the best title for the passage?
| A．An Extensive Collection of Glass Flowers |
| B．The Lives of Leopold and Rudolph |
| C．Flowers Native to the United States |
| D．Material Used for Artificial Flowers |
It can be inferred from the passage that the goal of Leopold and Rudolph was to _______.
| A．create a botanical garden where only exotic flowers grew |
| B．do a thorough study of plant structure |
| C．make a copy of one member of each United States flower family |
| D．show that glass are more realistic than wax flowers |
The underlined word “it” refers to _______.
| A．the intention | B．the collection |
| C．one member | D．each flower family |
The name “cowboy” conjures up many different images from movies, songs and TV. These imagined cowboys range from white-hat-wearing heroes to gun-shooting hooligans(流氓).But, cowboys are actually real people from US history.
When the US Civil War ended, many soldiers had no place to call home. So, they began to drift to the country's rural West. Ranchers(农场主) hired these men to take care of the cattle and work around the ranch. When the ranch owner wanted to sell the cattle, the cowboys would round up the herd from the open prairie(牧场) and drive the cattle miles to the market.
With the invention of barbed wire(铁丝网),the cowboy era(1865-1890) began to come to an end. But people in the East had always been curious about their lifestyle. Many country/western songs during this time tried to capture the true cowboy spirit. Newspapers published cowboy tales in serial form and adventure novels followed. The bigger the fiction, the better the sales. These novels often portrayed cowboys as cruel and violent men. Cowboys carried the bad reputation for many years afterwards.
When movies began to be popular in the 1920s,the cowboy image changed again. Now, a cowboy became the great white knight(骑士) that loved his horse more than the beautiful ladies he rescued. As the cowboy of the “Old West” spent more time with his horse than the ladies, this era's image was not entirely false.
Then, in the 50s,Hollywood began producing so-called “spaghetti westerns(意大利西部片)”.They earned the nickname because Italian companies financed the films and TV shows. This started the decade's “Cowboy Craze”.While this didn't last long, it made modern country/western music, fashion and dance extremely popular.
In recent years, with the help of musicians, radio stations and bars, cowboy nostalgia(怀旧情绪) has returned. Even though his image is still changing—somewhere between ballad singing country boy and barroom fighter—there's one thing for sure, you can't keep the cowboy down. During “the cowboy era” mentioned in the story, _______.
| A．the cowboy often came to the rescue of ladies in newspaper tales |
| B．the distant Wild West appealed to people in the East |
| C．cowboys were shown as cruel and violent men on the silver screen |
| D．country music started the cowboy craze which swept the whole country |
By saying “you can't keep the cowboy down”,the writer means that _______.
| A．cowboys are real people in history | B．cowboys still fascinate people |
| C．you can't make cowboys unhappy | D．you can't grasp the cowboy spirit |
Which of the following statements would the writer agree to?
| A．The cowboy has been presented in different lights in different eras. |
| B．Cowboys are gun-shooting hooligans, without doubt. |
| C．Cowboys have always been a passing phenomenon. |
| D．Cowboys enjoy Italian foods, for example, spaghetti. |
If you've been joining in chat room conversations, or trading e-mail with Web pals, you have become one of the millions who write in a peculiarly short form of English.
And you've got a sense of humor about short forms like SOHF(="sense" of humor failure) to describe Internet newcomers who don't understand you.
Across the globe, every night teenagers and their elders are “talking” online—many of them are talking at the same time.
It's fast: try talking to six people at once. It's brief: three or four words per exchange. It takes wit, concentration, and quick fingers.
And it requires tremendous linguistic economy. There's neither time nor space for explanations. Why consume precious key-strokes telling six friends you have to leave for a moment to take care of your little brother when BRB(="be" right back) will do? Want to enter a conversation? Just type PMFJI(="pardon" me for jumping in). Interested in whom you're talking to? Type A/S/L, the nearly universal request to know your pal's age, sex and location. You may get 15/M/NY as a response from your pal.
If something makes you laugh, say you're OTF(="on" the floor),or LOL(="laughing" out loud),or combine the two into ROTFL(="rolling" on the floor laughing).
And when it's time to get back to work or go to bed, you type GTG(="got" to go) or TTYL(talk to you later).
People want to write as fast as possible, and they want to get their ideas across as quickly as they can. Capital letters are left in the dust, except when expressing emotion, as it takes more time to hold down the “shift” key and capitals. Punctuation is going, too. In order to talk to several people at the same time on the Internet_______.
| A．you have to speak fast and fluently |
| B．you have to express your ideas in a brief way |
| C．you should speak with wit and humor |
| D．one should pay much attention to the accuracy of the words |
If you get 17/F/NY as an answer to your A/S/L, it means_______.
| A．the person on the other end is 17 from New York and he is fine |
| B．you are talking to a girl who is 17 and lives in New York |
| C．you are talking to 17 girls who are from New York |
| D．the person who are talking to you is a 1.7-foot tall New York girl |
To save time on the Internet_______.
| A．some people leave their letters in the dustbin |
| B．some people never use “shift” in their writing |
| C．many people leave the capital and punctuation |
| D．people seldom use capital letters or punctuation |
Methods of training animals have changed greatly in recent years. Zoo keepers have always had problems getting the animals to leave their cages in order for the cages to be cleaned, and also training them to move indoors when appropriate. Another problem was that many of the large animals became listless and bored. In the last twenty years, scientists have done research on dolphins and whales, training them to obey commands. The scientists found they could get animals to obey by rewarding them with food and affection when they responded correctly.
Proper training allows the animals to receive the care they need. It was very difficult to get untrained animals, especially the larger ones, to stay still when they needed medical attention. Now they can be trained, on command, to remain still and even to allow blood samples to be taken and shots administered. All this is accomplished through positive reinforcement, without the use of any force. Affection training, as this process is called, has been used with great success on a wide variety of zoo animals. Animal behavior experts have taught zoo keepers to train bears, tigers, monkeys, and many other species to behave in a way that provides for better animal-keeper interaction. This training also keeps the animals from becoming bored and inactive.
Although some people proclaim(谴责) that this training is inhumance and cruel to animals, results have shown that captive(猎获的)animals who previously were not doing well flourish under the new training procedures.The word “listless” means _______.
| A．countless | B．obedient |
| C．inactive | D．mysterious |
Which of the following is valid conclusion based on this passage?
| A．It is safe to pet any animal. |
| B．Many animals respond favorably to rewards and affection. |
| C．Animals in the wild can be trained. |
| D．Animals should not be kept in zoos. |
The writer's purpose is to _______.
| A．persuade people not to feed animals in the zoo |
| B．show how easy it is to train animals |
| C．explain method of training animals through rewards |
| D．criticize zoo keepers |
Which of the following is an opinion?
| A．Zoo keepers had problems in getting animals to leave their cages. |
| B．Training is cruel to animals. |
| C．Animals obey commands if they are trained to do so. |
| D．Many animals can be trained, on commands, to remain still. |