【正确答案】 D

【答案解析】[听力原文] 29-31
Miss Richards was a teacher at a school for boys and girls. She taught Chemistry and Physics from the lowest to the highest classes in the school.
One year the first class had been studying Chemistry for several weeks when Miss Richards suddenly asked, "What is water? Who knows hands up?"
There was silence for a few seconds, and Miss Richards felt disappointed, but then one boy raised his hand.
"Yes, Dick!" said Miss Richards encouragingly. He was not one of the brightest children in the class, so she was glad that he could answer.
"Water is a liquid which has no color until you wash your hands in it, Miss. Then it turns black." The boy replied with great confidence.
29. What did Miss Richards teach?

【正确答案】 C

【答案解析】[听力原文]
What did Miss Richards ask one class of new pupils one year?

【正确答案】 A

【答案解析】[听力原文]
What can we learn from the boy's reply?