— It is said that Zhang Jiajie City will hold the next Winter Olympics .

— Really ,_____ .

A．Good job !

B．It’ s up to you !

C．Congratulations !

D．I’ m glad to hear that .

单子叶植物根类中药维管束的主要类型是（）

A.有限外韧型

B.周木型

C.辐射型

D.周韧型

E.无限外韧型