题目内容
There have been many great inventions, which have changed the way we live. The first great invention was one that is still very important today---the wheel. This made it easier to carry heavy things to travel long distances. For hundreds of years after that there were few inventions that have made as much effect as the wheel. There was little unknown land left in the world. People didn't have to explore(开发) much any more. They began to work instead to make life better.
In the second half of the 19th century many great inventions were made. Among them were the camera, the electric light and the radio. These all became a big part of our life today. The first part of the 20th century saw more great inventions. The helicopter in 1909. Sound movies in 1926. The computer in 1928, and jet planes in 1930. This was also a time when a new material was made. Nylon came out in 1935. It changed the kind of clothes people wear. The middle part of the 20th brought new ways to help people get over diseases. They worked very well. They made people healthier and let them live long lives. By the 1960s most people could expect to live to be at least 60. By this time most people had a very good life. Of course new inventions continued to be made. But man now had a wish to explore again. The world is known to man but the stars are not yet. Man began looking for ways to go into space. Russia made the first step. Then the United States took a step. Since then other countries, including China and Japan, have made their steps into space.
68. The first great invention ever known was ______.
A. the camera B. the wheel C. the electric light D. the radio
69. Which of the following was turned out nearly at the same time with the jet plane?
A. The radio. B. The camera.
C. Nylon. D. The helicopter.
70. This passage talks mainly about ______.
A. how inventions affect (影响) people's life B. when electric light was invented
C. which country made the first step into space D. why cars were very important
71. We can safely come to the conclusion that people's life will be made even better through ______.
A. new discoveries? B. greater inventions
C. better ways to help people get over diseases? D. all of above
68---71 BCAD
Electric ears are dirty.In fact, not only are they dirty, they might even be more dirty than their gasoline-powered cousins.
People in California love to talk about "zero-emissions vehicles", but people in California seem to be clueless about where electricity comes from. Power plants mostly use fire to make it. Aside from the new folks who have their roofs covered with solar cells, we get our electricity from generators. Generators are fueled by something---usually coal, oil,but also by heat generated in nuclear power plants. There are a few wind farms and geothermal plants as well, but by far we get electricity mainly by burning something.
In other words, those "zero-emissions" cars are likely coal-burning cars. It's just because the coal is burned somewhere else that it looks clean. It is not. It's as if the California Greens are. covering their eyes---"If I can't see it, it's not happening." Gasoline is an incredibly efficient way to power a vehicle; a gallon of gas has a lot of energy in it.But when you take that gas (or another fuel) and first use it to make electricity, you waste a nice part of that energy, mostly in the form of wasted heat---at the generator, through the transmission lines, etc.
A gallon of gas may propel your car 25 miles. But the electricity you get from that gallon of gas won't get you nearly as far---so electric cars bum more fuel than gas-powered ones. If our electricity came mostly from nukes; or geothermal,or hydro, or solar, or wind,then an electric car truly would be clean. But for political, technical,and economic reasons,we don't use much of those energy sources.
In addition,electric cars' batteries which are poisonous for a long time will eventually end up in a landfill.And finally, When cars are the polluters, the pollution is spread across all the roads. When it's a power plant, though, all the junk is in one place. Nature is very good at cleaning up when things are too concentrated, but it takes a lot longer when all the garbage is in one spot.
【小题1】 What does "clueless" mean in paragraph 2?
| A．People are seeing the California Greens everywhere. |
| B．People in California love to talk about zero-emissions vehicles. |
| C．People in California love to have their roofs covered with solar cells. |
| D．People there have no idea that so far electricity mainly comes from burning |
【小题2】 What is the main idea of the passage?
| A．Electric cars are not clean at all |
| B．Electric cars are better than gasoline-powered ones. |
| C．People cast doubts on electric cars' batteries. |
| D．Gasoline is an efficient way to powera vehicle. |
| A．not less than 25 miles | B．more than 25 miles |
| C．no more than 25 miles | D．not more than 25 miles |
| A．do not burn fuel and more environmentally-friendly |
| B．are toxic because it is difficult for nature to clean it up when their batteries are buried in one spot. |
| C．are very good at cleaning up when things are not too concentrated |
| D．are poisonous for a long time and will eventually end up in a landfill |
| A．being green is good and should be encouraged in communication |
| B．electric cars are not clean in that we get electricity mainly by burning something |
| C．zero-emissions vehicles should be chosen to protect our environment |
| D．electric cars are now the dominant vehicle compared with gasoline-powered |