A:﹣1
B:1
C:﹣5
D:5
建国初期进行的抗美援朝、土地改革和镇压反革命这三大运动的共同作用是( )
A:What did you do yesterday?
B:I went to the bookstore and bought a magazine about film.
A:That's cool.
读“南北半球的海陆分布图”,完成下列问题。