单项选择题

Different ______ of linguistics have led to the popularity of different teaching methods.

A．classes
B．schools
C．grades
D．curricula
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单项选择题
The first-year students at college normally ______ in age from 17 to 20 years old.
A．vary
B．differ
C．range
D．alternate
单项选择题
Important newspapers are supposed to carry authentic news reports and try to be informative.
A．influential
B．reliable
C．frank
D．formal
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