内环境指的是
A．体液 B．细胞外液 C．细胞内液D．血液 E．超极化
参考答案：B
等腰三角形两边之和是18cm，这两边之差是8cm，则它的三边长分别是______．
Had I been a little more careful, I________such a foolish mistake. [ ]
A. won't make
B. hadn't made
C. didn't make
D. wouldn't have made
