问题补充：
The discovery of gold in California a rush to get there.
A. set off
B. set up
C. set out
D. set in
答案：
(答案→)A. set off
B. set up
C. set out
D. set in
解析：考查词组A．set off引爆，出发，B．set up建立，C．set out出发，D．set in设置，句意是：家里福利亚发现了金子引发了去那里的热潮。选A。
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