单项选择题

Hikers and campers often become infected by drinking water from______ streams.

A．configured
B．insulted
C．contaminated
D．condemned
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单项选择题
The English language contains a(n)______ of words which are comparatively seldom used in ordinary conversation.
A．altitude
B．latitude
C．multitude
D．attitude
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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