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华师大学英语2课后答案

Unit 1
Part Two: Read and Practice
Read and Think
II. Answer the following questions according to the text.
1.What are the main type of air Pollution?
An.: These include smog, acid rain, the greenhouse effect, and "holes" in the ozone layer.
2.Where does exhaust come from?
An.: The exhaust comes from burning fuels in automobiles, homes, and industries.
3.Why is the amount of carbon dioxide in the air continuing to increase?
An.: Carbon dioxide is produced when fuels are burned. Plants convert carbon dioxide back to oxygen, but the release of carbon dioxide from human activities is higher than the world's plants can process. The situation is made worse since many of the earth's forests are being removed, and plant life is being damaged by acid rain.
4.Can pollutants be created by indoor activities?
An.: Yes. Some pollutants can be created by indoor activities such as smoking and cooking.
5.What is the first step to solve air pollution?
An.: The first step to solve air pollution is assessment.
III. Put in the missing words according to the text.
There are several main types of pollution and well-known effects of pollution. One type of air pollution is the release of particles into the air from burning fuel for energy. Another type of pollution is the release of harmful gases in the atmosphere, forming smog and acid rain. The greenhouse effect is also referred to as global warming. In many countries in the world, steps are being taken to stop the damage to our environment from air pollution. They have set controls on pollution emissions for transportation vehicles and industry and we must meet the challenge in order to assure that a healthy environment will exist for ourselves and our children.
Read and Complete
IV. Spell the following words with the help of their meanings and first letters.
1. e ssential a. absolutely necessary. Vitally necessary
2. s? ubstance n. that which has mass and occupies space
3. s? ignificant a. important; of consequence; having or expressing a meaning
4. w? ell-being n. a contented state or being happy healthy and prosperous
5. exhaust n. gases ejected from an engine as waste products
6. convert v. to change the nature, purpose, or function of something
7. reaction n. a process in which one or more substances are changed into others
8. derive v. to obtain; to come from
9. consequence n. the outcome of an event especially as relative to an individual
10. exposure n. the state of being put into a situation in which something harmful or dangerous might affect you
V. Complete each of the following statements with the words you have learned in the text.
1. He explained that his delay was due to an accident.
2. For every action there is an equal and opposite reaction.
3. This is one of the most significant studies of the subject.
4. This garden has the best collection of native plants. In addition , it contains numerous trees and flowers from overseas.
5.The paint cam