单项选择题

Even before the treaties were ______, the "permanent Indian frontier" was moved farther west,

A．invalidated
B．proved
C．ratified
D．refuted
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单项选择题
This road is ______ to flood in summer, so it is necessary for us to build a reservoir during the drought.
A．liable
B．conducive
C．susceptible
D．prescriptive
单项选择题
Although a few contemporaries ______ the book, most either ignored or mocked it.
A．degraded
B．reconciled
C．ridiculed
D．appreciated
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