3、和加拿大,单程平均飞行4000多公里,沿途景象蔚为壮观。【预习检测】根据汉语提示完成句子。1.Ihavea________(极好的)sociallife.2.Themost profound unsolved problem in ______(生物学) is the origin of lifeitself.3.Some birds _______(迁徙) as seasonchanges.4.I__________(完全地) agreewith these views.5.The spelling of English is o