different species of rice plant，and then he could produce a new plant which could give a higher yield than either of the original plants. 他认为，唯一的办法是使不同种类的水稻杂交，这样就能生产比原先任何一种水稻产量都要高的新品种。 经典句式 the key to feeding people was to have by crossing 答案 3.

　　in a wheelchair and speaking through a special computer，he has become the voice of science. 靠轮椅来移动并且通过特殊的电脑说话，他(霍金)成为了科学的代言人。 4.Or was he carried miles into space，

　　the world’s first astronaut? 还是他被带到了数英里之外的太空，成了世界上第一位宇航员？ 5.The tubes were attached to a long stick which helped _________________

　　in a straight direction. 竹管被绑在一根帮助火箭直线运动的长棍上。 Moving becoming keep the rocket moving 答案

　　Yuan Longping is a 1.

　　(lead) figure in the rice­-growing world in China.He was interested in plants from 2.

　　early age，and he went to study agriculture in college and began crop breeding experiments 3.

　　a young teacher.Then he brought up a plan to produce 4.

　　(much) rice by crossing different species of rice plant.He put his plan 5.

　　practice and the results 6.

　　(publish) in China in 1966.In 1970，he discovered a 7._______ (natural) sterile male rice plant,8.

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