题目

下列环境问题产生与人们行为连线正确的是（          ） A．西北土地荒漠化——砍伐森林 B．东北平原水土流失——广种薄收 C．长江中上游山地滑坡——过度放牧 D．华北平原土地盐碱化——大量使用农药      答案：BMany objects that people use each day started with a simple idea. These objects have often changed the way we  46 . Some help us to do a job more   47 . Others fill a need or solve a problem. In 1858, Lipman had such an  48 . He took out a pencil, a piece of paper,   49 an eraser. Then he began to write. Sometimes he needed to  50  a word. Each time he had to search under his books and papers to   51  the eraser. “ I wish my eraser would stay in one 52 !” he said. Then Lipman had his simple idea. He   53  a groove(凹槽) in one end of the pencil. He glued(粘牢) the eraser into the groove. Lipman had solved his problem. Later he thought that others might like to have such a pencil. So he sold his  54 .Some pencils with erasers were 55 . His design earned $ 100000.【小题1】A．studyB．liveC．sleepD．walk【小题2】A．easilyB．correctlyC．carefullyD．normally【小题3】A．articleB．aim C．ideaD．action【小题4】A．soB．andC．butD．as【小题5】A．spellB．readC．writeD．change【小题6】A．lookB．seeC．watchD．find【小题7】A．placeB．deskC．bookD．hand【小题8】A．markedB．preparedC．cutD．invented【小题9】A．booksB．pencilC．designD．eraser【小题10】A．wonderfulB．expensiveC．colourfulD．common