2l．The crazy song Cangam Style is really turning into ____ ．global phenomenon, which gives some old people _ surprise
A． a；a B． the; the C．a; 不填 D．不填；a
22．—I prefer an iPhone made in your company, but I may need some more information about the product．
— ．
A． It' s my treat B． It ' s a pleasure．
C． At your service． D． It ' s a deal．
