单项选择题

Alex Haley was ______ unheard of until he wrote the novel Roots.

A．truly
B．roughly
C．genuinely
D．practically
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单项选择题
That matter is so ______ that it must not be discussed outside his office.
A．confidential
B．confident
C．private
D．mysterious
单项选择题
My grandfather was already over seventy, buy he was still ______ and lively.
A．effective
B．organic
C．singular
D．vigorous
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