and petrol production add particles (微粒) to the air. The effects of air pollution range from mild headaches to death. The levels of pollution found in heavy traffic may cause headaches for loss of clear vision. Wherever coal and oil are used for fuel, fumes may kill trees and plants and cause metal to corrode (腐蚀). In some of the larger cities, these fumes endanger the lives of human beings by contributing to lung diseases and causing early death.
1. The key point of the passage is that 【B】. A．the cause of air pollution is people
B．the causes and the effects of air pollution are both found in cities
C．the effects of air pollution range from headaches to death
2. What is the purpose of this passage? 【A】 A．to persuade people to stop polluting the air B．to tell the causes of air pollution C．to tell why cities are bad places to live
3. Why is air pollution more grave in the city than in the country? 【C】
A．Because there are larger populations in cities. B．Because the air in the city is dirty.
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C．Because there are much more gas fumes from cars and burning of coal and oil for energy in the city than in the country.
4. The fumes from coal and oil may cause metal 【A】. A．to corrode B．to twist C．to turn black
5. In larger cities, the fumes from coal and oil may contribute to 【C】. A．heart disease B．loss of clear vision C．lung diseases
二、阅读理解：阅读下面短文，选择合适的内容将短文补充完整。 A. to cook or heat your home B. checked regularly C. to reduce air pollution D. Use less electricity
E. Raising any sort of livestock
Man-made air pollution mainly comes from two sources: mobile ones and stationary ones. Mobile sources are cars, planes, boats, etc. Stationary sources include large factories, power plants and every household, which burns natural gas or
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wood. The most important ways _____【C】are to drive less, use less electricity and natural gas, and eat vegetarian. _THESE IDEAS ARE EASY TO FOLLOW:_
1. Get your car _____ 【B】to make sure everything works properly. Whenever possible, walk, cycle, carpool, or use public transportation. Buy fuel-efficient vehicles. Drive at 60 mph or less to improve gas mileage.
2. Burn less natural gas _____ .【A】Instead, use a solar cooker or heater and wear extra layers.
3. Become a vegetarian or a vegan. _____【E】requires more land and emits more carbon dioxide than simply growing crops directly for human food.
4. _____. 【D】Coal power plants produce most of the world’s electricity, and they also produce more carbon dioxide than any other source. Coal plants also release many other pollutants. Unplug televisions, cell phone chargers, and other appliances while not in use. Most devices continue to use small amounts of power even when they’re turned off. Avoid using air conditioning, and don’t leave the fridge open any longer than necessary. Only run the clothes washer or dish washer when full. Rather than using a dryer, hang clothes on a line to dry in the sun.
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单元自测7 形考任务试题及答案
题目为随机，用查找功能（Ctrl+F）搜索题目
题目： ___________ you busy with the Singles Day? Are
题目： —________
—Oh, no, Frankly speaking, I seldom do online shopping. Got any good deals? 题目：—________
—I mean the best way is using your own mobile phone or computer to operate it. What do you mean?
题目：— A:________are the most popular things people buy online?
—B: Definitely, clothes. What do you think
题目：— We have to stay at home for a whole day. Why not go out and have a walk? —________
It sounds like a good idea.
题目：— Susan ,what do you think of my plan? —_______________ It’s possible.
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题目：All the trees______ last summer. were planted
题目：Besides, you need to protect your password, because all the transaction _______ through your bank account. is carried out
题目：He __________ a book when the telephone rang. was reading
题目：Now tell me, how can you separate yourself ____the other person? from
题目：Separate passwords for every account make __difficult for cyber criminals to hack you. it
题目：The Prize in Economics ______ in 1968, that is, more than half a century ago. was established
题目：You can ask these experts __________advice in job hunting? for
题目：You can buy almost everything, _______ you have access to the Internet and enough money. as big as
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