【正文】 me. To outsiders, Americans seem tied to the clock. People in other cultures value relationships more than schedules. In these societies, people don39。s most precious gifts. And unwrapping it is half the fun. 4. What’s the main topic of this passage? A. What is time? B. Time among Americans. C. Make good use of time. D. How to control time? 5. What’s the meaning of the underlined word “conserve”? A. protect B. develop C. produce D. assist 6. The sentence Americans seem tied to the clock in paragraph 5 probably means________. A. Americans often carry a clock with them. B. Americans can take control over time. C. Americans often make full use of time. D. Americans can not predict the time. 7. We can safely draw a conclusion from this passage that _________. A. Americans have more time than others. B. by using pocket planners, people can have more time. C. for informal meeting, Americans often arrive 30 minutes earlier. D. Americans often attend seminars, because they want to use time better C To extinguish (熄滅 ) different kinds of fires, several types of fire extinguishers have been invented. They must be ready for immediate use when fire breaks out. Most portable (手提式的 ) kinds operate for less than a minute, so they are useful only on small fires. The law requires ships, trains, buses and planes to carry extinguishers. Since fuel, oxygen and heat must be present in order for fire to exist, one or more of these things must be removed or reduced to extinguish a fire. If the heat is reduced by cooling the material below a certain temperature, the fire goes out. The cooling method is the most mon way to put out a fire. Water is the best cooling material because it is low in cost and easy to get. Another method of extinguishing fire is by cutting off the oxygen. This is usually done by covering the fire with sand, steam or some other things. A blanket may be used to cover a small fire. A third method is called separation, which includes removing the fuel, or material easy to burn, from a fire, so that it can find no fuel. The method that is used to put out a fire depends upon the type of fire. Fires have been grouped in three classes. Fires in wood, paper, cloth and the like are called Class A fires. These materials usually help keep the fire on. Such fires can be stopped most readily by cooling with water. 8. If a fire breaks out on a bus, which of the follow should be ready there for you to use? A. Sand B. Water C. A blanket. D. An extinguisher. 9. To cover a small piece of burning wood with a basin（盆） in order to stop the fire is an example of . A. cutting off the oxygen B. reducing the heat C. removing the fuel D. separating the fire 10. In choosing how to put out a fire, we should first be clear about . A. when it breaks out B. what kind it is C. how it es about D. where it takes place 11. What would the author probably discuss in the paragraph that follows? A. Another type of extinguishers B. Another class of fires C. How fires break out. D. How fires can be prevented. D Could your cellphone give you cancer? Whether it could or not, some people are worrying about the possibility that phones, power lines and wifi could be responsible for a range of illnesses, from rashes to brain tumors. Some say there is evidence to support the growing anxieties. David Carpenter, a professor of environmental health sciences at the university at Albany, in New York, thinks there’s a greater than 95 percent chance that power lines can cause childhood leukemia (白血病 ). Also there’s a greater than 90 percent chance that cellphones can cause brain tumors. “It’s apparent now that there’s a real risk,” said Carpenter. But others believe th