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課程與PC端同步更新，充分利用零碎時間。做題
海量精選試題，想練就練，瞬間提分。答疑
網(wǎng)校名師24小時在線答疑解惑直播
名師大咖面對面，有問有大收獲多。Agriculture is the number one industry in the United States and agricultural products are the country's leading export. American farmers manage to feed not only the total population of the United States, but also millions of other people throughout the rest of the world. Corn and soybean exports alone account for approximately 75 percent of the amount sold in world markets.
This productivity, however, has its price. Intensive cultivation exposes the earth to the damaging forces of nature. Every year wind and water remove tons of rich soil from the nation's croplands.
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