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。
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