单项选择题

According to some economists' comments, unemployment is a ______ problem which won't just disappear overnight.

A．stubborn
B．revealing
C．ingenious
D．integral
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单项选择题
He ______ claimed his innocence and denied any involvement in that scandal.
A．startlingly
B．variably
C．virtually
D．persistently
单项选择题
They launched a campaign to protect animals and required many passers-by to sign a ______ against experiments on animals.
A．pamphlet
B．petition
C．plea
D．partition
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