______in four different countries,Jessie is a typical third culture kid,the term of which refers to

children who spend a period of time in one or more cultures. [ ]

A. Bring up    

B. Having brought up    

C. Bringing up            

D. Brought up

学校买来100个小皮球和6个排球，共花去156元。每个排球的价格比20个小皮球的价格还多4元。一个小皮球和一个排球各多少元？