问答题
下面是某高中教师的课堂教学片段。
T：Just now we get to know many different sports，for example ...
Ss：Weight-lifting，fencing，aerobics，triathlon，shooting ...
T：Great.Now，let´s think about this question：How many types can these sports be divided into？
Ss：（discuss with partners）
T：For example，football，tennis，table-tennis，they belong to ...
SI：Ball games.
T：Great.And then ...How about rings？Double bars？Which type of sports do they belong to？
Ss：（silent）
T：（write "gymnastics"on the blackboard）Now read after me ...
S2：Ms Xia，how to say "kua lan"in English？It is the honor of all our Chinese people.
T：Yeah，we really ought to know l l0-hurdle race.By the way，which type do both running and 110-hurdle race belong to？
Ss：（silent）
T：Let me tell you，track and field sports.Read after me.
Ss：（read after the teacher）
T：Don´t forget the sports that are done in the water--the water sports.So what are the different types of sports we´ve learnt today？
Ss：Ball games，gymnastics，track and field and water games.
T：Excellent!
根据上面所给信息．从下列两个方面作答：