阅读下面短文，根据其内容完成后面各项任务
In the Charles E. Johnson Elementary School in New York, there is a special radio. It gives people warnings（警报）about bad weather.
One day, there came a sound from the radio. This sound brought the piece of news:a heavy storm was coming. William Tom, principal（校长）of the school, asked teachers to bring children indoors and put them in a safe place at once.
Minutes later, the storm came. However, because of the warning of the radio and the quick work of the principal, no one was hurt.
“The radio really did work very well. （我们对它的工作感到很高兴），”William Tom said. “The parents were as well.”
The U.S. government hopes there will be more such success stories. It plans to give this kind of radios to all 97,000 public schools in the country.
Every year, more than 10,000 big thunderstorms, 2,500 floods, 1,000 tornadoes（龙卷风）and some hurricanes（飓风）take place in the U.S., so the warning radios are very useful. They not only give people warnings about bad weather, but also give warnings about other dangerous things.请根据短文内容，简要回答下列问题.
小题1:What does the special radio give people?
小题2:Why was no one hurt in the school in the storm?
小题3:请根据短文中所给汉语完成句子。
小题4:请把短文中划线的句子译成汉语。
小题5:请给短文拟一个恰当的英文标题。
，最后两者一起向右运动，即
，共同速度v=2m/s，当m在M上减速完毕后，在M给的向右的摩擦力作用下将向左做加速运动，M做减速运动，达到2m/s后一起匀速运动，所以m加速阶段M的速度大于2m/s，但系统的总动量仍保持8kgm/s，所以C正确，D中动量大于8kgm/s，不符合题意，D错误。