答案　for whom he has struggled

　　2．Dr Yuan searched for a way to increase rice harvests ______________________(而不需要增加土地面积) . (without)

　　答案　without expanding the area of the fields

　　3．Some organic farmers prefer planting grass between crops to ______________________(防止风或水把土壤带走). (prevent)

　　答案　prevent wind or water from carrying away the soil

　　Ⅲ.模仿造句

　　1．Dr Yuan Longping grows what_is_called super hybrid rice.

　　[翻译]经过3个月的航行，他们来到了现在称为美洲的地方。

　　答案　After three months' voyage，they came to what is called America today.

　　2．Born_in_1930，Dr Yuan graduated from Southwest Agricultural College in 1953.

　　[翻译]位于城市的中心地带，这座公园给市民带来很多享受。

　　答案　Located in the centre of the city, the park provides much enjoyment to the citizens.

　　3．Organic farmers, therefore, often prefer_using natural waste from animals as fertilizer.

　　[翻译]生活在城市里的人有很多更愿意住在乡下。

　　答案　Many people living in cities would prefer living in the countryside.

　　4．Crops such as peas or soybeans put important minerals back into the soil，making_it_ready for crops such as wheat or corn that need rich and fertile soil.

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