Farmers may think trees will take too long to grow and be effective. But some trees can grow quickly. At least one-third of the Delmarva farms have planted trees, technically known as vegetative environmental buffers. The idea offers a way to cut pollution, save money and energy, and make the neighbors happy.

　　49. The second paragraph mainly tells us ______.

　　A. planting trees as much as possible

　　B. the advantages of trees

　　C. how to reduce heating costs

　　D. why trees are received

　　【答案】B

　　【解析】主旨大意题。本段提到：树木可以吸收灰尘、氨气；可以提供阴凉；冬季减少供热成本；改善水质等，所以认为这是提到树木的好处。

　　50. The word “odor” in paragraph 3 means ______.

　　A. plant

　　B. smell

　　C. height

　　D. water

　　【答案】B

　　【解析】词义猜测题。根据第一段中They can also reduce the strong smell of ammonia gas.及第三段中Two thousand farms there can each house an average of seventy-five thousand chickens.可知人们讨厌农场的气味。

　　51. The farms on the Delmarva Peninsula used to use ______ in chicken houses to provide fresh air.

　　A. trees

　　B. tunnel fans C. windows D. poles

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