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China is going green. In order to reduce air pollution and oil shortages, automobile manufacturers have announced their plans to develop hybrid vehicles (混合燃料汽车) for the Chinese market. Toyota's hybrid car Prius will be ready to drive in China this week. Let's have a look at the new car.
Any vehicle is a hybrid when it combines two or more sources of power. Hybrid cars run off a rechargeable battery and gasoline. Hybrid cars have special engines, which are smaller than traditional gasoline engines. They run at 99 percent of their power when the car is cruising (匀速行驶). A specially designed battery motor provides extra power for running up hills or when extra acceleration is needed.
Step into a Prius, and turn on the engine. The first thing you notice is how much quieter it is than a traditional car. At this point, the car's gasoline engine is dormant (休眠). The electric motor will provide power until the car reaches about 24 km/h. If you stay at a low speed, you are effectively driving an electric car, with no gasoline being used, and no waste gas gives off.
The onboard(车载的) computer makes the decision about when to use a gas engine, when to go electric, and when to use a combination of the two. If you go over 24 km/h, when you step on the gas pedal (油门), you are actually telling the computer how fast you want to go.
The electronic motor recharges automatically using a set of batteries. When driving at high speed, the gasoline engine not only powers the car, but also charges the batteries. Any time you use the brake, the electric motor in the wheels will work like a generator and produce electricity to recharge the batteries. As a consequence, the car's batteries will last for around 200,000 miles.
1.The author writes this passage mainly to________.
A. teach people how to drive a hybrid car
B. show how to save their gasoline when driving a car
C. introduce a new kind of "green" car
D. announce plans to develop hybrid vehicles for China
2.The first sentence probably refers to ________.
A. there will be more and more green land in China
B. China has started producing environmentally friendly cars
C. China's new cars are combinations of different green models
D. China is still young and lacking experience
3.What is the most important feature of hybrid cars?
A. They have smaller engines than traditional gasoline ones.
B. They are much quieter than traditional cars.
C. They only use 99 percent of their power to run up hills.
D. They are powered by both a rechargeable battery and gasoline.
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China is going green. In order to reduce air pollution and oil shortages, automobile manufacturers have announced their plans to develop hybrid vehicles (混合燃料汽车) for the Chinese market. Toyota's hybrid car Prius will be ready to drive in China this week. Let's have a look at the new car.
Any vehicle is a hybrid when it combines two or more sources of power. Hybrid cars run off a rechargeable battery and gasoline. Hybrid cars have special engines, which are smaller than traditional gasoline engines. They run at 99 percent of their power when the car is cruising (匀速行驶). A specially designed battery motor provides extra power for running up hills or when extra acceleration is needed.
Step into a Prius, and turn on the engine. The first thing you notice is how much quieter it is than a traditional car. At this point, the car's gasoline engine is dormant (休眠). The electric motor will provide power until the car reaches about 24 km/h. If you stay at a low speed, you are effectively driving an electric car, with no gasoline being used, and no waste gas gives off.
The onboard (车载的) computer makes the decision about when to use a gas engine, when to go electric, and when to use a combination of the two. If you go over 24 km/h, when you step on the gas pedal (油门), you are actually telling the computer how fast you want to go.
The electronic motor recharges automatically using a set of batteries. When driving at high speed, the gasoline engine not only powers the car, but also charges the batteries. Any time you use the brake, the electric motor in the wheels will work like a generator and produce electricity to recharge the batteries. As a consequence, the car's batteries will last for around 200,000 miles.
1.The author writes this passage mainly to________.
A. teach people how to drive a hybrid car
B. introduce a new kind of “green” car
C. show how to save their gasoline when driving a car
D. announce plans to develop hybrid vehicles for China
2.Which of the followings is NOT true?
A. The hybrid cars reduce air pollution and oil shortages.
B. The car's gasoline engine doesn't work until it reaches about 24 km/h.
C. This kind of car is completely controlled by an onboard computer.
D. A specially designed battery motor provides extra power when needed.
3.What is the most important feature of hybrid cars?
A. They are powered by both a rechargeable battery and gasoline.
B. They are much quieter than traditional cars.
C. They only use 99 percent of their power to run up hills.
D. They have smaller engines than traditional gasoline ones.
4.What can we conclude from the story?
A. The batteries can be recharged at any time you want.
B. Using the brake suggests that the gasoline engine should work.
C. The batteries will last for 200, 000 miles without being recharged.
D. The gasoline engine charges the batteries as well as powers the car.
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China_is_going_green. In order to reduce air pollution and oilshortages, automobile manufacturers have announced their plans to develop hybrid vehicles (混合燃料汽车) for the Chinese market. Toyota's hybrid car Prius will be ready to drive in China this week. Let's have a look at the new car.
Any vehicle is a hybrid when it combines two or more sources of power. Hybrid cars run off a rechargeable battery and gasoline. Hybrid cars have special engines, which are smaller than traditional gasoline engines. They run at 99 percent of their power when the car is cruising (匀速行驶). A specially designed battery motor provides extra power for running up hills or when extra acceleration is needed.
Step into a Prius, and turn on the engine. The first thing you notice is how much quieter it is than a traditional car. At this point, the car's gasoline engine is dormant (休眠). The electric motor will provide power until the car reaches about 24 km/h. If you stay at a low speed, you are effectively driving an electric car, with no gasoline being used, and no waste gas gives off.
The onboard(车载的) computer makes the decision about when to use a gas engine, when to go electric, and when to use a combination of the two. If you go over 24 km/h, when you step on the gas pedal (油门), you are actually telling the computer how fast you want to go.
The electronic motor recharges automatically using a set of batteries. When driving at high speed, the gasoline engine not only powers the car, but also charges the batteries. Any time you use the brake, the electric motor in the wheels will work like a generator and produce electricity to recharge the batteries. As a consequence, the car's batteries will last for around 200,000 miles.
1.The author writes this passage mainly to________.
A．teach people how to drive a hybrid car
B．introduce a new kind of “green” car
C．show how to save their gasoline when driving a car
D．announce plans to develop hybrid vehicles for China
2.The first sentence probably refers to ________.
A．there will be more and more green land in China
B．China is still young and lacking experience
C．China's new cars are combinations of different green models
D．China has started producing environmentally friendly cars
3.Which of the followings is NOT true?
A．The hybrid cars reduce air pollution and oilshortages.
B．The car's gasoline engine doesn't work until it reaches about 24 km/h.
C．This kind of car is completely controlled by an onboard computer.
D．A specially designed battery motor provides extra power when needed.
4.What is the most important feature of hybrid cars?
A．They are powered by both a rechargeable battery and gasoline.
B．They are much quieter than traditional cars.
C．They only use 99 percent of their power to run up hills.
D．They have smaller engines than traditional gasoline ones.
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China is going green．In order to reduce air pollution and oil-shortages, car makers have announced their plans to develop hybrid（混合燃料）cars for the Chinese market．Toyota’s hybrid car Prius will be ready to drive in China this week．Let’s have a look at the new car.
Any vehicle is a hybrid car when it combines two or more sources of power．Hybrid cars have special engines, which are smaller than traditional gasoline engine．They run at 99 percent of their power when the car is going at a steady speed． A specially designed battery motor provides extra power for running up hills or when extra speed-up is needed．
Step into a Prius, and turn on the engine．The first thing you notice is how much quieter it is than a traditional car．At this point, the car’s gasoline engine is at rest．The electric motor will provide power until the car reaches about 24 kilometers per hour．If you stay at a low speed, you are effectively driving an electric car, with no gasoline being used, and no waste gas gives off.
The computer makes the decision about when to use a gas engine, when to go electric, and when to use a combination of the two．If you go over 24 kilometers per hour, when you step on the gas, you are actually telling the computer how fast you want to go.
The electronic motor recharges automatically using a set of batteries．When driving at a high speed, the gasoline engine not only powers the car, but also charges the batteries.
Any time you use the brake, the electric motor will work like a generator（发电机）and produce electricity to recharge the batteries．As a result, the car’s batteries will last for around 200,000 miles.
1.Which of the following pictures can show how the power system of Prius works correctly?（W—Wheel of the car, E.M—electric motor, G.E—gasoline engine, C—computer, B—batteries）
A．
B．
C．
D．
2.What is the most important characteristic of hybrid cars?
A． They are powered by both a rechargeable battery and gasoline.
B． They have smaller engines than traditional gasoline ones.
C． They use only 99 percent of their power to run up hills.
D． They are much quieter than traditional cars.
3.We can know from the report that ___________.
A． the batteries can be recharged at any time you want
B． using the brake suggests that the gasoline engine should work
C． the gasoline engine charges the batteries as well as powering the car
D． the car’s batteries will last for around 200,000 miles without being recharged
4.The author writes this passage mainly to ___________.
A． announce plans to develop hybrid cars for the Chinese market
B． let people know how to save their gasoline when driving a car
C． teach people how to drive a hybrid car
D． introduce a new kind of “green” car
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Because of air pollution being greatly reduced, this city is still ______.
| A．a good place which to be lived in | B．lived as a good place |
| C．a good place to live in | D．living in as a good place |
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Vitamin B could help reduce the effects of the dangerous type of air pollution, according to a new study published on Monday. In the first study of its kind, a team of international researchers looked into the damage caused by one of the pollutants that have the severest impact on health—PM2.5.
They found that Vitamin B supplement could effectively reduce the impact of the tiny particles （颗粒）on the human body, although they stressed that the research was in its early stages. According to the WHO, 92% of the world's people are living in places where the PM2.5 level goes beyond the recommended level. So it’s urgent to find a solution to the problem.
According to this study, published in the PNAS, 10 volunteers were initially exposed to clean air and given a placebo (安慰剂）to check their baseline responses. The group then kept on taking placebos tor tour weeks before being exposed to heavily polluted air from downtown Toronto, where an estimated 1,000 cars passed every hour. The bad air was delivered to the volunteers through an "oxygen type" face mask. The experiment was then repeated, with each volunteer taking a Vitamin B supplement daily, made up of 2.5mg of folic acid, 50mg of Vitamin B6, and l mg of Vitamin B12.
Vitamin B6 can be found in liver, chicken, nuts and other things, and Vitamin B12 in fish, meat, eggs, milk and some cereals. The researchers found that four weeks of Vitamin B supplements — the damage of PM2.5 effects by 28-76%. The results emphasized how prevention at an individual level could be used to fight against the damage of PM2.5, the researchers said.
1.What's the newly discovered effect of Vitamin B in Paragraph 1?
A. It can be used to replace other vitamins in our daily life.
B. It can help lower the air pollution level in the open air.
C. It can reduce the impact of PM2.5 on human bodies.
D. It can get rid of the pollutants remaining in our body.
2.What can be learned from the second paragraph?
A. Further study about the effect of Vitamin B needs to be done.
B. Vitamin B is the most important to human's health.
C. The tiny particles in the air are made up of PM2.5.
D. 92% of the world's people are affected by PM2.5.
3.How did researchers draw the new conclusion about Vitamin B?
A. By referring to a journal. B. By performing experiments.
C. By interviewing scientists. D. By comparing vitamins.
4.You may read the passage on a website about .
A. environment B. medicine
C. education D. health
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Nowadays ________ certain limit should be set on ________ use of cars to reduce air pollution.
A. /; the B. a; the C. the; / D. the; the
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Nowadays ________ certain limit should be set on ________ use of cars to reduce air pollution.
A．/; the B．a; the C．the; / D．the; the
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The pollution is likely to reach its peak on Monday, and some parts ________ heavy air pollution, the environmental watchdog told the newspaper.
A. see B. will see C. would see D. saw
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As people in Beijing and northern China struggle with severe air pollution this winter,the toxic(有毒的)air is also making life hard for plants and even food crops of China．
"in the last 50 years there has been a 1 6-fold increase in ozone(臭氧)pollution”in the Beijing area，said Hanqin Tian of Auburn University in Alabama,who studies the effects of China's pollution and climate change on plants．
Ozone is particularly harmful to plants because it damages the pores(气孔) on leaves，called stomata,which plants use to regulate how much water evaporates from the leaves．That，in turn，affectS how much water a plant must take up through its roots．Changes in water uptake by plants have been documented in other parts of the world，including the United States，as having major impacts on regional groundwater and surface water supplies．
In studies of the long-term productivity of plants，Hanqin Tian and some of his colleagues show that ozone pollution,along with climate change，has been lowering plant productivity in China,which reduces the amount of carbon and other pollutants that the plants Can absorb to fight all the emissions from the burning offossil fuels．
The worst effects on plants are likely to be in areas where the growing pollution problem is just fairly new, said Arthur Chappelka, also a plant researcher at Auburn University．Some plants are more resistant to pollutants than others，he said，and the plants that are living today in long-polluted urban areas are likely to be only those that are very pollution tolerant．
Away from the cities, however, where crops are necded to feed China’s yast population, the effeets of the growing pollution on crops is a significant concern.
“In some ways it affects the crop production and food securiy of China,”said Hanqin Tian.“Air quality is really important for human health, plants and ecosystem and sustainability.”
The problem is bound to get worse as China continues to develop economically, he said, and so he and other researchers continue to urge the Chinese government to take action to reduce emissions from cars and industries.
1.ozone does harm to plants mainly by ________.
A.exposing them to strong sunlight
B.damaging the structure of their leaves
C.adding more pores to the roots
D.making the land unfit for the plants to grow
2.Which of the following statement does Hanqin Tian support?
A.Ozone pollution has increased 1 6 times in the past 30 years．
B．Ozone pollution has lowered plant productivity alone．
C.Plants can take in a large amount of carbon and other pollutants．
D.The toxic air has few effects on food supply in China．
3.What Can we infer from the passage?
A．Healthy foods are not available in Beijing．
B．Some kinds of plants aren’t affected by air pollution．
C．Crops in China are hard to feed its large population．
D．People should stop developing economically
4.According to the passage，the Chinese govemment should
A．care more about developing economy
B．reduce the number of cars and industries
C．continue to make more researches
D．take measures to reduce carbon emissions
5.What′S the best title of the passage?
A．Polluted air damages plants and crops
B．Air pollution is becoming more serious
C．China’s air pollution and climate changes
D．Food security in China