我国山区面积广大,约占全国陆地面积的( )
A:1/2
B:1/3
C:2/3
D:3/4
某同学利用暑假去北京旅游,他想知道北京的位置,应该选择( )
东非裂谷带被誉为“地球的疤痕”,其形成原因是( )
It was the second time that we ________ in holding such important parties.