（16+9）×2，
=25×2，
=50（厘米），
答：它的周长是50厘米，
故选：C．
He was lying in hospital__________ ,with his ribs(肋骨)broken [ ]
A. half dead
B. deadly
C. dying
D. died
结构实体混凝土强度通常（）标准养护条件下的混凝土强度。
A.高于
B.等于
C.低于
D.大于等于
