4. Air Pollution
Air pollution is one of the major problems of the modern world. A great deal of energy is needed to run the factories of modern industrial nations. Automobile, trains, planes and busses need energy, too. Nearly all of this energy is produced by burning fuels. The burning produces wastes, some of which remain in the air, causing air pollution.
如何做到四六级英语与考研同步复习
Scientists are finding ways to stop air pollution especially in big industrial areas and densely-populated cities. They are studying new ways of generating electricity that may be less damaging to the environment. In the meantime, many power plants are being modernized to give off less polluted material. Also, engineers try to design and locate new power plants to do minimum damage to the environment.
However, it may be that we still have a long way to go before we have a clean world. Nearly all of the countries are trying hard to prevent and control air pollution. There indeed seems to be no end to tasks that environmentalists will be required to do. People will continually find new ways to control pollution.
2017届高考英语一轮复习基础巩固学案:Unit 2《Olympic Figures》(重大版必修5)
2017届高考英语一轮复习基础巩固学案:Unit 5《Special Clothes》(重大版必修1)
2017届高考英语一轮复习基础巩固学案:Unit 3《Powerful Music》(重大版必修1)
2017届高考英语一轮复习基础巩固学案:Unit 1《Friendship》(重大版必修1)
2017届高考英语一轮复习基础巩固学案:Unit 2《Working the land》(重大版必修4)
2017届高考英语一轮复习基础巩固学案:Unit 4《Unforgettable Films》(重大版必修1)
2017届高考英语一轮复习基础巩固学案:Unit 5《Nelson Mandela a modern hero》(重大版必修1)
2017届高考英语一轮复习基础巩固学案:Unit 1《Friends and Friendship》(重大版必修3)
2017届高考英语一轮复习基础巩固学案:Challenging Yourself Ⅱ Being Honest》(重大版必修2)
2017届高考英语一轮复习基础巩固学案:Unit 1《Women of achievement》(重大版必修4)
2017届高考英语一轮复习基础巩固学案:Challenging Yourself Ⅰ《Talking About Schools》(重大版必修1)
2017届高考英语一轮复习基础巩固学案:Unit 3《Project Hope》(重大版必修4)
2017届高考英语一轮复习基础巩固学案:Unit 6《Poems and Poets》(重大版必修3)
2017高考英语一轮专项训练:完形填空及阅读理解(4)含答案
2017届高考英语一轮复习基础巩固学案:Unit 3《A taste of English humour》(重大版必修4)
2017届高考英语一轮复习基础巩固学案:Challenging Yourself Ⅰ《Man and Pets》(重大版必修4)
2017届高考英语一轮复习基础巩固学案:Unit 5《Art and Culture》(重大版必修3)
2017届高考英语一轮复习基础巩固学案:Unit 1《Favourite Teachers》(重大版必修1)
2017届高考英语一轮复习基础巩固学案:Unit 1 Challenging Yourself Ⅰ(重大版选修8)
2017届高考英语一轮复习基础巩固学案:Unit 4《Perseverance and Success》(重大版必修3)
2017届高考英语一轮复习基础巩固学案:Unit 3 Challenging Yourself Ⅱ(重大版选修7)
2017届高考英语一轮复习基础巩固学案:Unit 1 Challenging Yourself Ⅰ(重大版选修7)
2017届高考英语一轮复习基础巩固学案:Unit 2《Helpful Schoolmates》(重大版必修1)
2017届高考英语一轮复习基础巩固学案:Unit 3《Living Planet》(重大版必修5)
2017届高考英语一轮复习基础巩固学案:Unit 1《Cultural relics》(重大版必修2)
2017届高考英语一轮复习基础巩固学案:Unit 1《Plant World》(重大版必修4)
2017届高考英语一轮复习基础巩固学案:Unit 3《Travel journal》(重大版必修1)
2017届高考英语一轮复习基础巩固学案:Unit 1《Learning English》(重大版必修2)
2017届高考英语一轮复习基础巩固学案:Challenging Yourself Ⅰ Using a Dictionary》(重大版必修2)
2017届高考英语一轮复习基础巩固学案:Unit 2《Parents and Children》(重大版必修3)
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