用化学用语填空．

（1）氮元素： ____．

（2）铝离子： ____．

（3）甲烷：____．

（4）高锰酸钾： ____．

若函数$f\left(x\right)=\left(2m+3\right)x^{m^2-3}$是幂函数，则$m$的值为（ 　 ）

    As is known,____ (play) team sport is popular all over the world, and participation in sporting____ (activity), such as football or basketball, is ____(benefit) to us in many aspects.

    To begin____, it can build up our bodies and help us keep fit physically,____in turn enables us____(avoid) overweight and other problems, such as high blood pressure.____ (add), it is a good way to develop some useful team skills, teamwork and strategies ____(include). Last but not ____(little), we often play sport for social reasons, for it is a good way of making new friends.

    ____, everyone should take an active part in team sports.