摘要:( )A.when B.before C.after D.while C Miss Richards was a teacher at a school for boys and girls. She 1 chemistry and physics from the lowest to the highest classes in the 2 . Sometimes the new classes 3 rapidly, but sometimes they were very 4 , and then Miss Richard's had to 5 things many times. One year, the first class had been studying chemistry for several 6 when Miss Richards suddenly asked, "What is water? Who knows? 7 up?" There was silence for a few seconds, and miss Richards felt saddened , but then one boy 8 his hand. "Yes, Dick?" said Miss Richards encouragingly . He was not one of the brightest children in the class, so she was 9 that he could answer. "Water is a liquid which has no 10 until you wash your hands in it, Miss. Then it turns black," the boy replied with great confidence .

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