--Are you used to in the north with the old couples?Yes I am glad to find out

问题补充：

----- Are you used to in the north with the old couples?

----- Yes, I am glad to find out that coal is used electricity for home use.

A. live; to produce

B. living; to produce

C. to live; produce

D. living; producing

答案：

A. live; to produce

(答案→)B. living; to produce

C. to live; produce

D. living; producing

解析：考查use用法。句意：你习惯和这对老夫妇住在北方吗？——是的，我很高兴发现煤是用来家用发电的。Be Used to sth/doing sth习惯于某事。下文be used to do sth 被用来做某事。故选B。原答案有误。