五角星有______条对称轴．
五角星共有5条对称轴，过每个角的顶点都有条对称轴．
故答案为5．
We're very glad to know that a great sports meeting _______ in Guiyang this September. [ ]
A. will hold
B. will be held
C. will be hold
柔嫩艾美尔球虫寄生于（）。
A、小肠前段
B、小肠后段
C、小肠中段
D、育肠
