The professor said that he was interested only in research; he didn’t ________ others’ comments.

A．care about

B．come about

C．bring about

D．get about

韶山型电力机车所用异步劈相机相当于一台（）的组合。

A.单相异步电动机和三相发电机

B.三相异步电动机和三相发电机

C.单相异步电动机和单相发电机

D.单机异步电动机和两相发电机