题目内容
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.
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
coal, oil,etc.
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.
3. The electricity we get from a gallon of gas may make our ear run
A. not less than 25 miles B. more than 25 miles
C. no more than 25 miles D. not more than 25 miles
4. According to the passage, electric cars .
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
5. It can be inferred from the passage that
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
cousins
1.D2.A3.D4.B5.B
【解析】略
阳光课堂课时优化作业系列答案请阅读下列应用文和相关信息，并按照要求匹配信息。请把相应选项字母涂在答题卡相应题号上。其中E用AB代表，F用CD代表。
首先，请阅读下列有关电器的介绍：
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[A] This 1000-wat electric boiler rapidly boils up to 1 quart of water for coffee, tea and more. It provides a rapid and quiet heating process, making it ideal for the office, home or students’ bedroom, and unit’s easy-open lid is designed with a security lock to prevent spilling. 
[B] This 12-inch everyday pan is made of aluminum, allowing for quick heat giving. The stainless-steel handles are comfortable to grasp, plus they decrease heat moving so handles stay cool on the stovetop. The included lid is ideal for moist-heat cooking. It cooks fast and is easy to clean and can cook everything with little oil or no oil.
[C] This lightweight carpet（地毯） cleaner comes with a display of convenient features. It gets under furniture and in hard-to-reach areas, and it is removable for easy clean-up. It provides heavy-duty cleaning for the worst type dirt, like high-traffic areas and pet stains, and dirty water and clean water always remain separate. It is ideal for carpeted stairs.
[D] This electric pressure washer is an ideal choice for home and auto cleaning projects. It features an instant stop or start function. It also includes an adjustable pressure nozzle(喷嘴), so you can adjust pressure from 100 PSI to 1300 PSI, and owns effective cleaning power.
[E] This solar light turns on automatically at dark and off at dawn. Show off garden accessories like fountains or light a path through your yard with a solar light that needs neither electricity nor maintenance. Solar lighting saves money and energy by gathering power from the sun.
[F] Keep the air in the home, office, or workplace circulating with this high-performance fan. It features a design for fast, focused cooling and effective air circulation. It also comes equipped with a three-speed motor and a specially-designed blade, which provides different power. Thoughtfully designed, the fan can also be wall mounted to help save floor space.阅读以下消费者的信息，然后匹配他们拟要购买的电器。
Final examination is coming near and it is getting hotter and hotter. Jojo studies hard at her desk, often wet through with sweat. Now what she most wants to get is some kind of instrument that can cool her while she is doing her lessons at the desk so she can have a better learning result.
It is only a few days before Christmas Day. Fan and his family are to give their house a thorough cleaning. As his father has some trouble with his health, Fan volunteers to take the task of cleaning the walls. In order to do a better job, he is eager to find an ideal instrument to match his aim.
For the purpose of being admitted by a key university, Lena has been burying herself in lessons and often studies until late into the night so that she often feels tired out and sleepy. “Why not refresh myself with a cup of coffee now and then?” She thinks and then she comes up with an idea….
Jean has decided to go hiking with her classmates for a holiday and hopes to have a picnic by cooking in the open air to add pleasure and fun to their trip. Now she is given the task that she should get an instrument with which they can cook delicious dishes.
Rachel’s mother is a cleaner whose job is to get clean kinds of floors, including carpets of many buildings. The boring work—especially the stair carpet cleaning—often makes her mother worn out. So Rachel is anxious to buy her an easy-to-use machine to take the place of her mother’s heavy work.
（E）
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A．Importance of Transport in Trade |
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B．Birth of Transport-related Industries and Trade |
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C．Role of Transport in Trade Development |
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D．Another Means to Develop Trade |
E．Higher Living Standard
F．Modern Life Needs Modern Traffics
80．
Transport is one of the aids to trade．By moving goods from places where they are plentiful to places where they are scarce, transport adds to their value．The more easily goods can be brought over the distance that separates producer and consumer, the better for trade．When there were no railways, no good roads, no canals, and only small sailing ships, trade was on a small scale．
81．
The great advances made in transport during the last two hundred years were accompanied by a big increase in trade．Bigger and faster ships enabled a trade in meat to develop between Britain and New Zealand, for instance．Quicker transport makes possible mass-production and big business, drawing supplies from, and selling goods to, all parts of the globe．Big factories could not exist without transport to carry the large number of workers they need to and from their homes．Big city stores could not have developed unless customers could travel easily from the suburbs and goods delivered to their homes．Big cities could not survive unless food could be brought from a distance．
82．
Transport also prevents waste．Much of the fish landed at the ports would be wasted if it could not be taken quickly to inland towns．Transport has given us a much greater variety of foods and goods since we no longer have to live on what is produced locally．Foods which at one time could be obtained only during a part of the year can now be obtained all through the year．Transport has raised the standard of living．
83．
By moving fuel, raw materials, and even power, for example, through electric cables, transport has led to the establishment of industries and trade in areas where they would have been impossible before．Districts and countries can concentrate on making things which they can do better and more cheaply than others and can then exchange them with one another．The cheaper and quicker transport becomes, the longer the distance over which goods can profitably be carried．Countries with poor transport have a lower standard of living．
84．
Commerce requires not only the moving of goods and people but also the carrying of messages and information．Means of communication, like telephones, cables and radio, send information about prices, supplies, and changing conditions in different parts of the world．In this way, advanced communication system also help to develop trade．