单项选择题

In some cases, different approaches to the same scientific problem lead ______ conflicting theories.

A．at
B．to
C．of
D．for
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单项选择题
Yesterday we saw a ______ film about the Independence War.
A．historied
B．historical
C．historian
D．historic
单项选择题
I hear that in some countries children are ______ from buying cigarette.
A．forbidden
B．banned
C．not allowed
D．prohibited
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