A:look at
B:look after
C:look for
Alice ____ ____ ____ be an English teacher when she was young.
如下图是用不透水的云母片以不同方式分别插入三株燕麦幼苗的胚芽鞘尖端部分,并分别从不同方向给以光照,培养一段时间后,胚芽鞘的生长情况是( )
读南极地区图,完成下列问题.