雅尔塔体制形成的根本原因是                                   (    )

A．以苏联为首的社会主义阵营形成

B．美苏国家利益产生冲突

C．世界大战改变了各国政治力量的对比

D．美苏意识形态方面的对立

What do we know about Susan().

A.She learned Spanish in America.

B.She doesn’t know Spanish.

C.She improved her Spanish in Mexico.

D.She knew Spanish before going to Mexico.