Blue－green algae grow abundantly in salt marshes.
A、primarilyD
暂无解析
ThefuturesurvivalofthebaldeagleisstillanimportantAmericanecologicalconcern.
Formerly,intheUnitedStates,manynursesworkedasprivatedutynursesratherthaninhospitals.
Inliterature,caricatures讽刺画usuallycontainverbalexaggerationthroughwhichthewriterachievescomicandoftensatiric讽刺effects.
Thecontrolsofmostmodernairplanescanbeoperatedeithermanuallyorautomatically.
HowmanypeopleareawarethatadancerwiththeNewYorkCityBallettypicallywearsoutaminimumoftwohundredpairsoftoeshoesperyear?
