—What does Roger Brown do for a living?

—He is one of the most successful________ in the city.

A．newspaper reporter

B．newspaper’s reporters

C．newspaper’s reporter

D．newspaper reporters

下列属于同系物的是（  ）

A．硬脂酸甘油酯和乙酸乙酯

B．甲酸和软脂酸

C．丙烯酸（CH₂=CHCOOH）和油酸

D．油酸和硬脂酸