As everybody knows，kangaroos are native________Australia and are often regarded as one of Australia’s national treasures.

A．in　　

B．to

C．from 　

D．with

决定可摘局部义齿基托伸展范围的是（）

A.义齿的支持类型

B.人工牙的种类

C.基托的种类

D.缺失牙的时间

E.黏膜的厚度