Lucy liked all the dresses there，but she took the ______one to save as much money as possible for Project Hope.

A．cheaper

B．more expensive

C．cheapest

D．most expensive

我国发展对外经济关系必须坚持的原则是（）？

A.独立自主、自力更生

B.积极开拓国际市场

C.贯彻落实科学发展观

D.提高开放型经济水平