Question

This is ________ apple, and that is ________ orange.

A．a; a

B．a; an

C．an; an

D．an; a

Answer 1

C

介绍事物类别用不定冠词a或an，元音音素前用an，辅音音素前用a，apple和orange的第一个音都是元音，故本题选C。