问题补充：
She is always ready to help people in trouble because she thinks it is a .
A. business
B. reward
C. pleasure
D. favor
答案：
A. business
B. reward
(答案→)C. pleasure
D. favor
解析：business为“商业，业务”；reward为“回报”；favor为“喜爱”，pleasure“愉快的事”。本题It’s a pleasure是固定搭配，指“乐于助人是一件令人愉快的事”。
