Our playground is not so tidy and beautiful as before, students must ____ dirty things on it.  

A．be stopped to throw

B．be stopped throwing

C．stop to throw

D．stop from throwing

领队或全陪手中的接待计划与地陪的接待计划有部分出入时，( )应及时向组团社查明原因，分清责任。

A．旅游团领队

B．海外旅行社

C．全陪导游员

D．地陪导游员