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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