Most cities in the country have introduced "Clean Air Zones" _____ factories and households are only allowed to burn smokeless fuel.
举一反三
- 四. 段落翻译All around the world， large cities have the same problem：air pollution．Mexico City has very bad air．The air there is dirty and very unhealthy．Cars are one reason for the dirty air．Many Mexicans own their own cars and drive in the city．The factories in the area also cause air pollution．It is not easy to clean up the air in large cities．The government has to make new laws．
- Cities have allowed people to cooperate more easily.
- This is one of the most interesting cities _____I have evervisited．
- Sandy derives utility from consuming 'all other goods,' g, and clean air (measured by particulate matter removed per m3), a, as measured by the utility function U(g,a) = g0.6a0.4. The price of 'all other goods' is $20 and the price of clean air (abatement) equals $10. Brian is the only other consumer in the market for clean air and demands 10 units of clean air. What is the market demand for clean air?
- Why does industry do much damage to the sea? A: Because most factories have proper waste-treatment plants. B: Because many factories have not proper waste-treatment plants even<br/>the most modern one. C: Because just the modern factory has a waste treatment plant. D: Because neither ordinary factories nor most modern ones have p roper<br/>waste-treatment plants.