― How do you like your English professor?

― He has lots of interesting _______ abroad, and in a word, he is a teacher of rich     

_________.

A．experiences, experiences

B．experience, experience

C．experiences, experience

D．experience, experiences

以下提供若干组考题，每组考题共同使用在考题前列出的A、B、C、D、E五个备选答案。请从中选择一个与问题关系密切的答案。

离子型表面活性剂的溶解度急剧增加时的温度

A．起昙
B．Krafft点
C．共沉淀
D．HLB
E．CMC