色素痣出现哪些改变时应警惕恶变的可能()
A．长出毛发
B．迅速增大
C．颜色加深、色素不均匀
D．表面自行破溃
参考答案：B, C, D
— Excuse me. Could you please tell me where I can get the dictionary?
— ______. There's a bookstore on Yimeng Road.
A. Sorry
B. Sure
C. Good idea
D. Thank you
如图7所示，已知各轮齿数分别为：
