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
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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
单项选择题
Guests at this house are amazed by the flowers and a well-kept lawn traversed by concrete walks.
A．crossed
B．consolidated
C．hovered
D．enclosed
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