【学道】2018-2019学年北师大版高中英语必修三课件 Unit 7 预习新
【学道】2018-2019学年北师大版高中英语必修三课件 Unit 7 预习新第4页

If you have swum in the sea,you know that it is salty.You can taste the salt.Rivers,which flow into the sea,carry salt from the land into the sea.Some parts of the sea are saltier than other parts.There is one sea,called the Dead Sea,which is very salty.It is so salty that swimmers cannot sink!Fish cannot live in the Dead Sea!