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 authorities are investigating the ______ abuses of housing benefits disclosed online.
A．alleged
B．involved
C．imagined
D．cancelled
单项选择题
The tunnels should be strengthened because of their ______ to an attack that could result in mass casualties.
A．punctuality
B．simuhaneity
C．vulnerability
D．reliability
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