单项选择题

A．Gold was discovered.
B．The Transcontinental Railroad was completed.
C．The Golden Gate Bridge was constructed.
D．Telegraph communications were established with the East.
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单项选择题
Normally a student would at least attend ______ classes each week.
A．36
B．12
C．20
D．15
单项选择题
American university students are usually under pressure of work because ______.
A．their academic performance will affect their future careers
B．they am heavily involved in student affairs
C．they have to run for positions of authority
D．they have to attend a lot of classes
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