单项选择题
A.ecologist
B.biologist
C.geologist
D.anthropologist
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单项选择题
A.discoverB.look forC.uncoverD.search for
A.discover
B.look for
C.uncover
D.search for
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单项选择题
A.inB.fromC.ofD.up
A.in
B.from
C.of
D.up
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