题目

At the beginning of this term, we had to stay at home and take online lessons. Every morning, I turned 【1】 my computer and logged onto Ding Talk to have my lessons. We could listen to our teachers and see 【2】(they) faces at the same time. As for me, online education has many good 【3】(point). First, it is easy and 【4】(help). If I can't understand any part, I can watch it again and again u【5】 I totally understand it. 【6】(Two), teachers can choose proper video lessons on the Internet for us to learn. This provides us 【7】(many) methods to learn than before. Third, we ca在下面一组图形中：（1）各图形中分别有几个三角形？（2）说出各个图形中以B为顶点的角所对的边.