【正文】
Miss Richards was a teacher at a school. She 26 chemistry(化學 )and physics in the 27 . Sometimes the students learned fast, but sometimes they were very 28 , and then Miss Richards had to say the same things again and 29 . 訓練案 One day, Miss Richards suddenly asked in class,“ What is water? 30 knows? Hands up. ” There was silence(沉默 )for a few 31 , and Miss Richards felt sad but then one boy 32 his hand. “Yes, Dick?” said Miss Richards encouragingly. 訓練案 Dick was not 33 of the brightest students in the class, so she was 34 that he could answer the question. “Water is a liquid(液體 )which has no color 35 you wash your hands with it. Then it turns black,” the boy replied. 訓練案 ( )26. A. studied B. learned C. taught D.