题目

On Monday evening, I received a message online from a student who had got a very mean message in his locker (小柜). He took a picture of it and sent it to me asking for   41  . I suggested that he  42   me at break the following morning. A few hours later, I   43  on the Internet that he had posted the picture of the mean note and asked if anyone   44   who it was. Obviously, he was trying to give the person who did it a little  45   in coming forward.     The next day when the   46  came, the boy came to me and another   47  was with him. The boy showed m16的算术平方根是A．±4B．±8C．4D．8