Nowadays many travelers usually take photos with koalas in Australia. These photos are good memories.
A：is
B：her
C：their
下列化学方程式正确的是( )
Our Chinese teacher encouraged us _______ up even if we made a serious mistake in our writing work.
阅读材料回答问题
材料：小峻对班级工作认真负责，热心帮助同学，人缘好朋友多，他也非常快乐。有一天，他为了开玩笑，居然把坐在前面的女同学小婷的头发剪掉了几根，使小婷哭笑不得。根据材料回答下列问题。
