Some people prefer to work and live in Chengdu, for the price of an apartment is less than half of ________ of big cities like Beijing, Shanghai, and Guangzhou.

A．it

B．what

C．that

D．One

按照国家有关部门规定，建设项目设计概算应在（）阶段编制。

A.前期决策

B.初步设计

C.施工图设计

D.施工期间