Researchers began dealing with the problem in 2000.They found that over a period of six years，planting three rows of trees reduced total dust and ammonia by more than half.And they found that smells were reduced by 18%.

　　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.

　　1．How does the new ventilation system work？(No more than 7 words)

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　　2．What is the maximum capacity of poultry farms in Delmarva？(No more than 2 words)

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　　3．What are the benefits planting trees can bring about？(No more than 11 words)

　　________________________________________________________________________

　　4．What is the best title of the passage？(No more than 10 words)

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　　课后达标检测21

　　Ⅰ.单项填空

　　1．解析：选A。let out“泄露；一不留神说出”；take care“注意；小心”；make sure“确信；证实”；make out“辨认出来”。

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