问题
单项选择题
随着网络科技的发展，电子商务的强力推动，属于现代第三产业的物流业迅速发展起来。物流业的发展是因为（）
①它有利于推动我国产业结构优化
②它有利于提高我国居民恩格尔系数
③电子商务服务和物流业有互补关系
④电子商务服务和物流业有替代关系
A.②③
B.①③
C.②④
D.①④
答案
参考答案：B
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随着网络科技的发展，电子商务的强力推动，属于现代第三产业的物流业迅速发展起来。物流业的发展是因为（）
①它有利于推动我国产业结构优化
②它有利于提高我国居民恩格尔系数
③电子商务服务和物流业有互补关系
④电子商务服务和物流业有替代关系
A.②③
B.①③
C.②④
D.①④
参考答案：B
Many 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.
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