Miss Gorgers taught physices in a New York school. Last month she explained to one of her classes about sound, and she decided to test them to see how successful she had been in her explanation. She said to them, Now I have a brother in Los Angeles. If I was calling him on the phone and at the same time you were 75 feet away, listening to me from across the street, which of you would hear what I said earlier, my brother or you and for what reason?
Tom at once answered, Your brother. Because electricity travels faster than sound waves. Thats very good, Miss Gorgers answered; but then one of the girls raised her hand, and Miss Gorgers said, Yes, Kate?
I disagree, Kate said. Your brother would hear you earlier because when its 11 oclock here its only 8 oclock in Los Angeles.
1. Miss Gorgers was teaching her class .
A. how to telephone B. about electricity
C. about time zone(时区) D. about sound
2. Miss Gorgers asked this question because she wanted to know whether .
A. it was easy to phone to Los Angeles
B. her student could hear her from 75 feet away
C. her students had grasped(理解)her lesson
D. sound waves were slower than electricity
3. Tom thought that electricity was .
A. slower than sound waves B. faster than sound waves