The future survival of the bald eagle is still an important American ecological concern.
A、migrationC
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In1861itseemedinevitablethattheSouthernstateswouldbreakawayfromtheUnion.
Withlasersscientistscanprobemanyphysicalprocesses,suchascombustion,oncebeyondourken.视野
ThecompanyissuesanannualreporteveryMarch.
WhileBillieHolidaydidnotinventthemusiccalled"theblues",shemostassuredlyhelpedpopularizeit.
Cometsarestillregardedwithawebysomepeople.
