没有足够的食物导致身体不健康，从而引发疾病。

　　4．____________________hunger is very important for some African countries.

　　对一些非洲国家来说，摆脱饥饿是非常重要的。

　　5．______________new scientific farming methods, they have been able to use less farmland than in the past.

　　有了新的科学的耕种方法，他们能够使用比过去少的耕地(生产出与过去同等量的稻子)。

　　Ⅳ.课文回顾

　　Yuan Longping, 1.________(know) as China's “father of hybrid rice”， is one of China's most famous scientists. Over the past five decades, he 2.________ (struggle) for an approach to increasing the output of rice without expanding the area of the fields. Born in 1930, Dr Yuan graduated from Southwest Agricultural College in 1953. Since then, 3.________ (find) ways to grow more rice has been his life goal. At that time, 4.________ (hungry) was a 5.________ (disturb) problem in many parts of the countryside. In 1973, he became the first agricultural pioneer in the world 6.________ (grow) rice that has a high output. His dream to help the world get rid of hunger came true.

　　Dr Yuan devoted himself to the research into agriculture and 7.________(honour) by UNESCO & FAO. He is quite 8.________ (satisfy) with his life but doesn't care about being famous or leading a 9.________ (comfort) life. 10.________he is 70 years old, he is still working on the research into agriculture.

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