Urban renewal programs strive to upgrade areas that are becoming slums.
A、reproachB
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TheSalkvaccineisamajorfactorinthefighttoeradicatepolio.
Foodmustbemoistinordertohaveataste.
Alllivingorganisms,regardlessoftheiruniqueidentity,havecertainbiological,chemical,andphysicalcharacteristicsincommon.
Someanimalspantandsweattospeedevaporationofbodymoistureandthuscoolthemselves.
Anoversight遗漏(miss,overslaugh)inproofreadingoftenresultsinprintederrors.
