It’s quite natural that kids like to play with friends their own age.A. ofB. atC. withD.

问题补充：

It’s quite natural that kids like to play with friends their own age.

A. of

B. at

C. with

D. in

答案：

(答案→)A. of

B. at

C. with

D. in

解析：考查介词：of+抽象名词，表示“…的”of their own age同龄的，作定语修饰friends，句意是：孩子们喜欢和同龄的朋友一起玩很自然。选A。