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Question 5 of 6
What two practices does the professor suggest for reducing the amount of nitrogen that enters a bay such as the Chesapeake?

A.

Planting trees along the sides of streams

B.

Building water treatment facilities where streams enter the bay

C.

Planting cover crops that take up excess nitrogen in the soil

D.

Letting farm animals graze in areas near streams and the bay

我的答案:

正确答案:AC

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