假如你叫大明，收到了你的英国朋友Tony的来信，信中他很关心四川雅安地震后学生的情况。请你根据他的来信内容写一封回信，感谢他对灾区学生的关心，回答他的问题，并谈谈你的感受。
提示词语：thank you, care to， go on， government ，offer，encourage， brave　
Dear Daming,
I'm sorry to hear that a big earthquake happened in Ya'an, Sichuan. Some school buildings broke down in the earthquake and many students couldn't go to school. But I know the government is trying their best to help them. And Chinese people are so strong and brave that they aren’t afraid of anything difficult. Can the students go on studying now? Please tell me more about them.
I'm looking forward to hearing from you soon.
Yours, 
Tony
Dear Tony,
I'm glad to hear from you
Best wishes.  
Yours
Daming

如图甲所示，小球恰好悬浮在盛有6℃的水的烧杯里，水的密度随温度的变化如图乙所示．现把烧杯放进冰柜里面，在烧杯内水的温度下降到0℃的过程中，假设小球的体积始终不变，下列说法正确的是（　　）