肺结核的卫星灶的病理改变是下列哪项（）
A.渗出灶
B.增殖灶
C.纤维化灶
D.空洞
E.钙化灶
参考答案：B
如果等边三角形的边长为3，那么连结各边中点所成的三角形的周长为▲ .
When the thief found the police had already __________ him, he ran away quickly.[ ]
A. realized
B. known
C. spotted
D. stared
