精选优质文档-倾情为你奉上完形填空练习题12篇。要求：切合本单元主题。附中文导读、练习题、答案及解析、核心词汇提炼，难度适宜。Yuan Longping is a Chinese agricultural scientist and educa tor, known for developing the first hybrid rice varieties in the 1970s.Born in 1930 and a 1 from the Southwest Agriculture Institute in 1953, Yuan began his 2 career at an agriculture school in Anjiang, Hunan Province.He 3 an idea for hybridizing rice in the 1960s. Since then, he has 4 himself to the research and development of a better rice b
