A:What's your favourite food?
B:What are your favourite clothes?
C:What's your favourite school work?
青藏铁路是世界上海拔最高的铁路,在建设过程中最不利的自然因素是( )
文章在写百草园时插入了美女蛇的故事,选出下面分析正确的一项:( )