It is normal for kids to feel anxious and not to be able to ______ their studies just before a quiz or

an examination. Parents should try their best to help them relax within their power.      [ ]

A. settle down    

B. devote to  

C. get down for    

D. settle down to

MRPⅡ的销售管理子系统中不包括客户关系管理。( )