64.We must improve the farming methodwe may get high yields.
答案解析
解析：
相关题目
146.of the twins was arrested because I saw them both at a party last night.
145.The students in that university are not fewer thanin our university.
144.His new appointment takesfrom the beginning of next month.
143.The managing director took thefor the accident, although it was not his fault.
142.I don＇t thinknecessary for Julie to make such a fuss about that sort of thing.
141.Tomorrow I＇m leaving for New York and I＇ 11 stay there for.
140.Many companies are seeking to exploit and develop the rich naturalin the west region.
139.Men are usually quite good at map-reading, but Tom is a( n) •
138.While convenient for communication, mobile phones may have a negativeon children.
137.He kept walking up and down, which was a surethat he was very worried.
