摘要：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. 1. A．teaches B．teaching C．taught D．teach 2. A．schooling B．school C．schools D．home 3. A．learned B．learning C．had been learned D．were learned 4. A．slow B．being slow C．slowly D．slowest 5. A．repeated B．repeating C．do D．repeat 6. A．years B．minutes C．weeks D．seconds 7. A．Put B．Hands C．Get D．Look 8. A．lows B．ride C．raised D．put 9. A．sad B．glad C．angry D．hungry 10. A．colour B．colourful C．colourless D．with colour

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