All living organisms, regardless of their unique identity, have certain biological, chemical, and physical characteristics in common.
A、asaresultofD
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Some children display an unquenchable 难以抑制的 curiosity about every new thing they encounter.
TheSalkvaccineisamajorfactorinthefighttoeradicatepolio.
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Withtheacquisitionofsmallercompaniesbylargerones,the1960'ssawawaveofnewconglomerates.
