亚当·斯密的绝对利益学说和大卫·李嘉图的比较利益学说都是从劳动生产率差异的角度来解释国际贸易的起因。( )
参考答案：对
下列史实不能反映为中外友好而进行的是[ ]
A．郑和下西洋
B．戚继光抗倭
C．鉴真东渡
D．玄奘西行
— What did your teacher say just now?
— He asked me this morning. [ ]
A. how did Tom come to school
B. when Tom got to school
C. why was Tom late for school
