【简答题】Miss Gorgers taught physices in a New York school. Lastmonth she explained to one of her classes about sound, and she decided to testthem to see how successful she had been in her explanation. She sai...
【简答题】Miss Gorgers taught physices in a New York school. Lastmonth she explained to one of her classes about sound, and she decided to testthem to see how successful she had been in her explanation. She sai...