3.15×0.1____3.15
0.98÷0.8____0.98
28.9÷10____2.89
0.45×0.45____0.45.
-_________, are you Jane?
-Yes, I am.
①懂礼节有礼貌表现
②是尊敬老师的表现
③能够增进师生感情
④是追求时尚的表现