题干
Mr. Brown is so strict ______ us that everyone in Grade 8 is scared _____ him.
A： in, of
B： with, of
C： in with
D： with, in
答案(点此获取答案解析）
B
作圆
的两条切线，切点分别为A，B，已知
，若
,则
的最小值是