普拉提的伸展练习可以放在练习前、练习中、（）时进行。
参考答案：练习结束
已知等腰三角形的两边长分别为5、9，则它的周长为（ ）
A．19
B．23
C．14
D．19或23
I admit that there are problems, I don't agree that they can't be solved. [ ]
A. If
B. As
C. While
D. Since
