The elderly people still prefer to live in the countryside city life is considered as co

问题补充：

The elderly people still prefer to live in the countryside, city life is considered as convenient and fast.

A. while

B. unless

C. though

D. as

答案：

A. while

B. unless

(答案→)C. though

D. as

解析：C 考察让步状语从句。句义：尽管城市生活被认为是方便快捷的，但是老年人仍然喜欢住在农村。While意为尽管，虽然。故C正确。