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duonghien90lk
2 năm trước
Hãy cho biết Al, 2O, 7Na, 9C chỉ gì? làm nhanh dùm mk
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AIR POLLUTION Every one wants to (1)……………. pollution. But the pollution problem is as (2)…………….as it is serious. It is complicated (3)…………….much pollution is caused by things that benefit people. For example (4)…………….from automobiles causes a large (5)…………….of all air pollution. But the automobile (6)……………. transportation for millions of people.Factories (7)…………….much of waste that pollutes air and water, but factories gives employment to a large number of people. Thus to end or greatly reduce pollution (8)…………….people would have to stop using many things that benefit them. Most of people don’t want to do that, of course. But pollution can be (9)…………….reduced in several ways. Scientists and engineers can work to lessen the amount of pollution that such things as automobiles and factories cause. Governments can pass and enforce laws that (10)…………….businesses and traffic to stop or cut down on certain polluting activities. 1. A. cause B. destroy C. lessen D. increase 2. A. easy B. simple C. permanent D. complicated 3. A. because B. so that C. although D. when 4. A. gas B. exhaust C. vapour D. garbage 5. A. series B. percentage C. number D. emission 6. A. carries B. gives C. provides D. brings 7. A. discharge B. provide C. supply D. cause 8. A. gradually B. obviously C. differently D. immediately 9. A. only B. gradually C. clearly D. directly 10. A. forbit B. require C. permit D. prevent

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