Many children your age are always a good mood to do what they’re interested in. A. at inB

问题补充：

Many children your age are always a good mood to do what they’re interested in.

A. at, in

B. of, in

C. at, on

D. of, with

答案：

A. at, in

(答案→)B. of, in

C. at, on

D. of, with

解析：句意：许多你这个年龄的孩子都有很好的心情去做他们感兴趣的事。介词短语of one’s age和某人同岁；in a good mood有很好的心情。选B。

考点: 考查介词短语的用法。