肾动脉造影的主要用途有（）
A.用于诊断
B.用于栓塞治疗
C.腔内血管扩张
D.用于明确肾的功能
E.用于明确肿瘤的范围
参考答案：A, B, C
8个三位连续自然数能依次被1，2，3，4，5，6，7，8整除，则这8个三位数中最小的是______．
There are __ in the reading room, but many of those books aren’t __ to read． [ ]
A. enough books，enough easy
B. enough books，easy enough
C. book enough，easy enough
D. book enough，enough easy
