Unit2Illhelptocleanupthecityparks. 知识点SectionA1.Illhelptocleanupthecityparks.WeneedtocomeupwithaplanfortheCityParkClean-UpDay.cleanup 动词短语“ 打扫( 或清除) 干净”clean-up 名词“ 清扫，清除，清理”eg. 教室很脏。请把它打扫干净。Youmustgiveyourclassroomagoodclean-up.Theclassroomisdirty.Pleasecleanitup.你们必须对教室进行彻底地打扫。 河流清理the_oftheriver cleanup2.Thegirlcouldvolunteerinanafter-schoolstudyprogramtoteachkids.volunteerv. 义务做，自愿做n. 志愿者volunteertodosth. 自愿做volunteerforsth. 为了某事而自愿我们学校有些学生自愿去公园植树。Somestudentsinourschoolvolunteertoplanttrees
