—They started working on the show two months ago, didn’t they?

—___________. A lot of work needed to be finished before the show.

A．Yes, they did

B．No, they didn’t

C．Yes, they didn’t

D．No, they did

脑动静脉畸形是常见的脑血管畸形，下面描述正确的是（）。

A.脑动静脉畸形好发于幕下

B.脑动静脉畸形好发于基底节、丘脑

C.CT平扫示等或高密度团块，可确诊

D.增强CT扫描示曲张血管增强，占位效应轻或不明显

E.MRI不能显示钙化，诊断脑动静脉畸形不如CT好