题目

You'll soon graduate from junior high school and step into a new environment. When you are in the new environment, you must have a strong wish to fit in.【1】Here is some advice that can help.First, it's important to be confident. Everyone is special in this world.【2】In this way, you will be able to build up confidence day by day. You won't have much difficulty fitting in.Second, kindness is the bridge to your own happiness. When people notice your kindness, they will return it one day. 【3】 A person who cares for others is popular everywhere.Third, being active in group activities ca下列各式公因式是a的是（ ）A. ax＋ay＋5 B．3ma－6ma2 C．4a2＋10ab D．a2－2a＋ma