The senior senator has in the past three terms both experienced the sweet taste of success and the bitterness of defeat in his legislation fights with his opponents.

A．both experiences

B．experiences both

C．experience both

D．experienced both

乳剂受光、热、空气及微生物作用，使体系中油或乳化剂发生变质的现象称为（）

A.分层

B.合并

C.转相

D.破裂

E.酸败