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阅读下面材料,在空白处填入适当的内容(1个单词)或括号内单词的正确形式。将答案填写在答题卷的相应位置。

Yuan Longping grows 1. is called super hybrid rice. This special strain of rice makes it possible 2. (produce) 20% more of the crop in the same fields.

Born in 1930, Yuan graduated from Southwest Agricultural College in 1953. Since then, finding ways to grow more rice 3. (be) his life goal. As a young man, he saw the great need for increasing the output. At that time, hunger was a 4. (disturb) problem. Yuan searched for a way to increase rice harvests 5. expanding the area of the fields. In 1950, Chinese farmers could produce about 56 million tons of rice. In a recent harvest, 6. , nearly 200 million tons of rice was produced. These 7. (increase) harvests mean now 225 of the world’s people 8. (feed) from 7% of the farmland in the world. Yuan is now circulating his knowledge in India, Vietnam and many other less developed 9. (country) to increase their rice harvest. 10.(use) his hybrid rice, farmers are producing harvests twice as large as before.

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