Dogs are very to people. They’re people’s good .A. friends friendlyB. friendly friendsC.

问题补充：

Dogs are very to people. They’re people’s good .

A. friends,friendly

B. friendly, friends

C. friends, friend

D. friendly, friendly

答案：

A. friends,friendly

(答案→)B. friendly, friends

C. friends, friend

D. friendly, friendly

解析：friendly形容词，友好的；friend名词，朋友。句意：狗对人类很友好。他们是人们的好朋友。结合语境可知选B。