声波遇到障碍物会被反射回来形成回声，而我们人耳能够分辨出两次声音的时间间隔为0.1s，已知常温下声音在空气中传播的速度为____ m/s，所以我们能听到回声的最短距离为____ 　m．

根据短文内容及首字母提示完成短文，使短文完整、通顺

In America, we go to s____from Monday to Friday. On school days, I     g____up at seven and have my breakfast at half p____seven. Our lessons  s____at eight. And we d____have many lessons in a day. At half past eleven, we have a b____and then we have our l____at school. In the afternoon, we finish school at about three. Then we can g____home. But many boys in my school l____to play football in the playground after school.

What a____your school day?

伟大的文学家鲁迅说过： “友谊就是两颗心真诚相待，而不是一颗心对另一颗心的敲打。”对这句名言正确的理解是（）