“亦师亦友”主张启发我们( )
A:老师的职责是与学生交朋友
B:老师是我们的友伴
C:边学习边交朋友
D:教师教会学生如何交朋友
Tony knows China very well because he ______ in China for twenty years.
Can you stand on the s____ of the planet Mars without wearing special boots?