In class we _______ into several groups to have a discussion. That's quite different from the traditional classes.
A:are divided
B:divide
C:divided
_______ you have visited the Great Wall, you can't imagine how great it is.
该图为“大气热力作用示意简图”,下列说法正确的是( )
下图为亚洲大陆沿北纬30度地形剖面图,关于甲地区的叙述,正确的是( )
仔细观察,你发现地球仪上没有表示出来的事物是( )