Question

---Why is he so happy?

Answer 1

A

考查短语辨析。takes part in参加，takes an interest in 对什么感兴趣，takes pride in 由于什么而自豪，takes cares of 照顾，句意：他为什么这么高兴呢？他参加了志愿俱乐部为老年人工作。所以选A。