单项选择题


A．uncovered
B．discovered
C．unearthed
D．found out
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单项选择题
A．as a source ofB．to look forC．for supply ofD．in search of
A．as a source of
B．to look for
C．for supply of
D．in search of
单项选择题
A．peopleB．manC．scientistsD．the man
A．people
B．man
C．scientists
D．the man
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