Thesea高二英语课件

张立英UNIT 16 THE SEAsurfingenjoying the sunshineswimmingPre-readingdiscussion， check your pre-homework 1How does sea water stay clean? 2How salty is the waterin the ocean?35%，11% or 25%? 3 Where is the saltiest lake in the world? 4How much ofthe earth’s surface is sea?45%，56% or 71%?，