She is going to have ____ X-rays examination this morning.

She is going to have ____ X-rays examination this morning.
A、a
B、an
C、the
D、some
【正确答案】：B
【题目解析】：【考点点击】本题考查冠词的用法。【要点透析】音标以辅音音素开头的词前用a,音标以元音音素开头的词前用an,本句中X光读音为元音开头,因此用an来修饰。