B) local governments in the U.S. can expect big profits from recycling
C) recycling is to be recommended both economically and environmentally
D) landfills will still be widely used for waste disposal
参考答案
21. A 22. C 23. B 24. D 25. C 26. B 27. D 28. D 29. C 30. A
31. B 32. A 33. C 34. B 35. C 36. D 37. A 38. B 39. D 40. C
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