根据首字母提示完成下列短文。

    A good class monitor gets on well w____ classmates and likes to h____ others. He often cleans the classroom and makes the classroom c____ just like h____. C____ him to be your monitor.

因缺少激素而引起的疾病是  

一根铁丝长6.28cm，正好在一个圆形铁圈上绕满5圈，这个线圈的半径是多少米？