【判断题】Every day, the news of the world is relayed to people by over 300 million copies of daily papers, over 400 million radio sets, and over 150 million television sets. Additional news is shown by motion ...
【简答题】Every day 25 million U.S. children ride school buses. The safety record for these buses is much better than for passenger cars; but nevertheless, about 10 children are killed each year riding on large...