一个种群内,不同年龄阶段的个体数量,幼年最多,老年最少,中年居中,这个种群的年龄结构型为()
A、稳定型OnwhichdateareJamesandAlangoingtomeet?
Theday____(在那天我第一次遇见他)wasthefirstofMayontheGreatWall.
Asisknowntousall,theage_____childrencangotoschoolisseven.
Iwanttogotothegrocery,butyou_______withme.
Theaeroplane____shewastravelingwasdelayedforthreehoursatleast.