单项选择题
The city is an important railroad __ and industrial and convention center.
A．conjunction
B．network
C．junction
D．link
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单项选择题
Nobody yet knows how long and how seriously the ______ in the financial system will drag down the economy.
A．shallowness
B．shakiness
C．scantiness
D．stiffness
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单项选择题
These causes produced the great change in the country that modernized the ______ of higher education from the mid- 1860's to the mid- 1880's.
A．branch
B．category
C．domain
D．scope
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