问题补充：
-What’s the matter with John? He has been sitting there for hours.
-A postcard from his fatheran attack of home-sickness in him.
A. took up
B. set off
C. brought in
D. built up
答案：
A. took up
(答案→)B. set off
C. brought in
D. built up
解析：短语辨析。A占据，从事于，开始做；B引起，使…发生；C介绍，引进，赚钱；D逐步建立；句意：—John怎么了？他坐在那里好几个小时了。—爸爸给他寄的一张明信片让他开始想家了。本题中的set off指引起的意思。故B正确。
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