“各出所学，各尽所知，使国家富强，不受外侮，足以自立于地球之上。”说这句话的人物的主要成就是（   ）

A．发明了“侯氏制碱法”

B．提出地质办学的理论和方法

C．建成了钱塘江大桥　　

D．修建了京张铁路

After studying in a medical college for five years, Jane ________ her job as a doctor in the countryside.

[ ]

A. set out  

B. took over

C. took up  

D. set up