单项选择题

Internet, a ______ of millions of computers linked world wide, is the largest system serving e-mail messengers.

A．unity
B．connection
C．network
D．combination
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单项选择题
While doing calculation for the project, the designers ______ a new solution to a geological problem.
A．fell into
B．stumbled upon
C．set out
D．discovered
单项选择题
Having ______ so many obstacles, she established her fame as a first-rate actress at last.
A．removed
B．surmounted
C．resumed
D．harnessed
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