22.Yuan Longping is a plant scientist.People often call (1)
(he) the father of hybrid rice (雜交水稻) because of his important and world-changing work on the hybrid rice plant. Yuan was born in Beijing in 1930 and graduated(2)
the Southwest University of Agriculture in Chongqing in 1953.After graduation,he became a teacher at a school in Hunan Provjye.aice.In the 1960s,China experienced some bad(3)
(nature) disasters and a lot of the country's rice crops (4)
(destroy).It caused a big problem.At the time,China's population was growing very quickly,and the supplies of rice had not yet recovered.China's farmers found (5)
hard to feed all of the people in the country with the available supply of rice.A solution was needed. In 1964,Yuan found a kind of hybrid rice plant with advantages over current (目前的) types.He experimented a lot and developed a way(6)
(product) this hybrid rice in large amounts.(7)
,the first hybrid rice plant was not very successful.He experimented and worked with(8)
(other),and by 1973,he (9)
(find) a way successfully to create a higher-producing species (品種) of rice.The new species was able to grow 20% (10)