Ⅱ.完成句子
1．His face, arms and body are just like those of millions of Chinese farmers, ________ (他一直在为他们努力着) for the past five decades. (struggle)
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
