The discovery of gold in California a rush to get there.A. set offB. set upC. set outD. se

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。