大学英语四级阅读的200篇: Unit 32 passage 4_大学英语阅读

　　C. 50 years later. D. 100 years later.

　　29. This practice in Paragraph 4 refers to_______.

　　A. that farmers have lowered the yield of corn and soybean

　　B. that farmers have expanded croplands

　　C. that farmers have applied more chemical fertilizers

　　D. that the top soil has been decreased greatly

　　30. All of the following are statements about the disadvantages of fertilizers EXCEPT that

　　A. they replenish the soil B. they do not prevent the loss of soil

　　C. they are destroying the ecology D. they pollute the nations water supply

　　答案： 26. D 27. B 28. B 29. C 30. A

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