People who do not sleep enough tend to become irritable .
A、easilyannoyedA
暂无解析
Blue－greenalgaegrowabundantlyinsaltmarshes.
Communicationisoneofthemostimportantbondsthatholdculturalsystemstogether.
A mythical(imaginary) creature, the dragon was believed to have lion's claws, scaly skin, and fiery breath.
Despite the proliferation of other faster modes of transportation, the railroads remain the largest carriers of intercity freight in the United States.
TheSalkvaccineisamajorfactorinthefighttoeradicatepolio.
