课文填空

searched for ,  feed,  Thanks to , use  , born ,  graduated from,  without ,  circulate,  increase,  disturb

_________  into a poor farmer's family in 1930, Dr Yuan_________  Southwest Agricultural College in 1953. Since then, finding ways to grow more rice has been his life goal. As a young man, he saw the great need for_________  the rice output. At that time, hunger was a_________  problem in many parts of the countryside. Dr Yuan_________ a way to increase rice harvests_________ expanding the area of the fields. In 1950, Chinese farmers could produce only fifty million tons of rice. In a recent harvest, however, nearly two hundred million tons of rice was produced. These increased harvests mean that 22% of the world's people are_________ from just 7% of the farmland in China. Dr Yuan is now_________  his knowledge in India, Vietnam and many other less developed countries to increase their rice harvests. _________  his research, the UN has more tools in the battle to rid the world of hunger. _________  his hybrid rice, farmers are producing harvests twice as large as before.