The future survival of the bald eagle is still an important American ecological concern.
A、migrationC
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Thecontrolsofmostmodernairplanescanbeoperatedeithermanuallyorautomatically.
Inliterature,caricatures讽刺画usuallycontainverbalexaggerationthroughwhichthewriterachievescomicandoftensatiric讽刺effects.
Somechildrendisplayanunquenchable难以抑制的curiosityabouteverynewthingtheyencounter.
Foodmustbemoistinordertohaveataste.
Solidgeometryhasenabledastronomerstocalculatethepositionsoftheheavenlybodiesrelativetooneanother.
