乳腺异常CT表现可见于（）
A.乳腺结构紊乱
B.良、恶性肿瘤
C.淋巴结肿大
D.皮肤增厚
E. * * 凹陷
参考答案：A, B, C, D, E
活塞离曲轴中心线最远的位置叫（）。
They have never been to Disneyland _____? [ ]
A. haven't they
B. have they
C. do they
D. have they
