A:No, it was just so-so
B:The same to you
C:No, that’s all right
D:It’s my pleasure
在下列各纬度处,一年之中既没有太阳直射,又没有极昼、极夜现象的是 ( )
衡量政治参与有序无序的准绳是法律和规则。( )
When I ____ (arrive) in US, I'll call you.