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BFor his 86th birthday,Cheng Xiangwen enjoyed a corn-shaped cake his colleagues hadprepared for him."My birthday wish is to develop better corn varieties,"he says.After thecelebration,he began another journey to Sanya,in South China's Hainan Province,where hehas worked most of his life.Cheng is a scientist in agriculture and spends most of his life stud-ying and cultivating (corn.He visits Sanya in November every year and stays there forsix months to cultivate corn.Once,when he was conducting a field survey,a female farmer said to him in tears,"Yougraduated from college.Could you please find a way to increase the corn output here?If theyields (are higher,our children will no longer suffer from hunger.Since then,Chenghas made developing high-yield corn varieties his life's mission.In 1964,he came to Hainan,where it was warmer,and started his work there.He great-安ly shortened the cultivation period and created hybrid corn varieties for the first time.Withthese new varieties,farmers in Xunxian County saw their average corn output was more than学3,750 kg per hectare per year.Despite the beautiful coastline,the environment where Cheng works used to be troubled烯by poverty and poor traffic.Locals once described the area as having a large number of rats,mosquitoes,and poisonous snakes.At that time,he did everything on his own.He lived in a&local villager's house and he frequently went to the mountains to chop firewood to cook.Hishard work,however,has paid off.Now,authorities have approved 14 new,high-yield corn洲varieties Cheng helped develop.Cheng is dedicated to developing high-yield corn varieties with stronger resistance and烟they are easier to harvest with machines.He still goes to the fields each day and observes andrecords the corn plants."Cultivating seeds is like raising kids.Only by careful parenting can蝶you become familiar with their strengths and weaknesses and help them to grow up healthily,"hesays.傅24.What can we infer about Cheng according to paragraph 1?A.He was born in Hainan Province.B.He works in Sanya for less than half a year.C.He rested for a long time after his birthday.D.He wants to develop higher-yield corn varieties.25.In which paragraph can we know the cause of Cheng's life's mission?A.Paragraph 1.B.Paragraph 2.C.Paragraph 3.D.Paragraph 4.26.What kind of difficulty did Cheng meet with in Hainan?A.Unbearable hot weather.B.Building a house without help.C.Living on poisonous creatures.D.The terrible living conditions and surroundings.【高三英语第4页（共10页）】【807·HEB·