题目

Yuan Longping grows     61   is called super hybrid rice． This special strain of rice makes it possible     62    (produce) 20% more of the crop in the same fields． Born in 1930, Yuan graduated from Southwest Agricultural College in 1953． Since then, finding ways to grow more rice     63    (be) his life goal． As a young man, he saw the great need for increasing the output． At that time, hunger was a   64     (disturb) problem． Yuan searched for a way to increase rice harvests     65    expanding the area of the fields． In 1950, Chinese farmers could produce about 56 million tons of rice． In a recent harvest,     66  , nearly 200 million tons of rice was produced． These     67    (increase) harvests mean now 225 of the world’s people     68     (feed) from 7% of the farmland in the world．Yuan is now circulating his knowledge in India, Vietnam and many other less developed   69    (country) to increase their rice harvest．    70    (use) his hybrid rice, famers are producing harvests twice as large as before． 答案：61．what      62．to produce    63．has been      64．disturbing        65．without   66．however  67．increased     68．are fed      69．countries         70．Using

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