Some pessimistic experts feel that the automobile is bound to fall into disuse. They see a day in the not-too-distant future when all autos will be abandoned and allowed to rust. Other authorities, however, think the auto is here to stay. They hold that the car will remain a leading means of urban travel in the foreseeable future. The motorcar will undoubtedly change significantly over the next 30 years. It should become smaller, safer, and more economical, and should not be powered by the gasoline engine. The car of the future should be far more pollution-free than present types. Regardless of its power source, the auto in the future will still be the main problem in urban traffic congestion ( ). One proposed solution to this problem is the automated highway system. When the auto enters the highway system, a retractable ( ) arm will drop from the auto and make contact with a rail, which is similar to those powering subway trains electrically. Once attached to the rail, the car will become electrically powered from the system, and control of the vehicle will pass to a central computer. The computer will then monitor all of the car 's movements. The driver will use a telephone to dial instructions about his destination into the system. The computer will calculate the best route, and reserve space for the car all the way to the correct exit from the highway. The driver will then be free to relax and wait for the buzzer ( ) that will warn him of his coming exit. It is estimated that an automated highway will be able to handle 10,000 vehicles per hour, compared with the 1,500 to 2,000 vehicles that can be carried by a present-day highway. In an automated highway system, all the driver needs to do is _ . A) keep in the right lane B) wait to arrive at his destination C) keep in constant touch with the computer center D) inform the system of his destination by phone
D
No matter what he is doing,every human being gives body heat.The usual problem is how to _ it.But the designers of the Johnstown campus of the university of Pittsburg set themselves the opposite problem--how to collect body heat.They have designed a collection system which uses not only body heat but also the heat given off by such objects as light bulbs and refrigerators as well.The system works so well that no conventional fuel is needed to make the campus's six buildings comfortable. Some parts of most modern buildings--theatres and offices as well as classrooms-are more than heated by people and lights and sometimes must be air-conditioned even in the winter.The technique of saving and redistributing it is called "heat recovery".A few modern buildings recover heat,but the university's system is the first to recover heat from some buildings and reuse it in others. Along the way,Pitt has learned a great deal about some of its heat producers.The harder a student studies,the more heat his body gives off.Male students emit more heat than female students,and the larger a student,the more heat he produces.It is tempting to conclude that the hottest prospect for the Johnstown campus would be a hard-working,overweight male genius. According to the passage,the following statements are true EXCEPT_. A) fat,male and hard-working students give off more heat B) six buildings are heated by the heat system on the prefix = st1 /Johnstowncampus C) the heat is supplied by human bodies,other heat-omitting objects D) the heat from human bodies,other heat-omitting objects is only used in cold winter
D
Q: The Price of a Dream I grew up poor. We had little money, but plenty of love and attention. I understood that no matter how poor a person was, they could still afford a dream. My dream was athletics. By the time I was sixteen, I was good at baseball and football. My high-school coach was Ollie Jarvis. He not only believed in me, but taught me the difference between having a dream and showing conviction . One summer a friend recommended me for a summer job. This meant a chance for money in my pocket -- cash for dates with girls, certainly, money for a new bike and new clothes, and the start of savings for a house for my mother. Then I realized I would have to give up summer baseball to handle the work schedule, and that meant I would have to tell Coach Jarvis I wouldn't be playing. I was dreading this, but my mother said: " _ " When I told Coach Jarvis, he was as mad as I expected him to be. "Your playing days are limited. You can't afford to waste them," he said. I stood before him with my head hanging, trying to think of the words that would explain to him why my dream of buying my mom a house. "How much are you going to make at this job, son?" he demanded. "Three twenty-five an hour," I replied. "Well," he asked, "is $3.25 an hour the price of a dream?" That question laid bare for me the difference between wanting something right now and having a goal. I devoted myself to sports that summer, and within the year I was drafted by the Pittsburgh Pirates to play rookie-league ball, and offered a $20,000 contract. I signed with the Denver Broncos in 1984 for $1.7 million, and bought my mother the house of my dream. When the boy was offered a job, he wanted to _ . A) balance summer baseball and the work schedule B) refuse the job offer for summer baseball C) give up summer baseball for the job D) ask his coach Jarvis for advice
A: C
The ozone layer is a thin layer of gas around the earth. It forms a special "blanket" around the planet. This "blanket" protects the earth from dangerous rays produced by the sun. Without the ozone layer, the earth's climate could warm to dangerous levels. This increase in temperature would threaten our survival. Scientists recently have discovered a hole in the ozone layer above the Antarctica. Now there is great concern that this warning has started, endangering all life on the earth. What has destroyed part of the ozone layer? Scientists do not know for sure. They suspect that our popular spray cans have played a part in the damage. Many spray cans contain dangerous gases. These gases might have destroyed the ozone layer fifteen miles above the earth's surface, The chemicals used in refrigerators and air conditioners may contribute to the problem, too. Many scientists believe that the destruction of the ozone layer is a serious problem for people everywhere. Global warming could change weather patterns around the world. Farmers and ranchers could find it more and more difficult to produce enough food for the earth's people. If more of the sun's dangerous rays reached the earth, there also could be an increase in skin cancers. Some skin cancers might cause people to die. Although some scientists do not believe there is a serious danger, obviously no one wants to take any chance on such a possibility. Can scientists repair the hole in the ozone layer? They really don't know the answer to that question. Can people do anything to save the ozone layer that the earth still has? Scientists stress the need to limit the use of spray cans and other items that contain the dangerous gases. This will not be an easy task. People all over the world use these items. Solving the problem certainly will require commitment and cooperation from everyone. Saving the ozone layer needs everyone's effort because _ . A) scientists are badly in need of others' help B) items containing dangerous gases should be forbidden C) scientists can't afford so much money to take measures D) people all over the world use items containing dangerous gases
D