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清华版英语五年级下册《UNIT 3 THE ENVIRONMENT AND US Lesson 17》优质课ppt课件
white:
polar regions （极地地区）
blue：water
salt water ----
fresh water ----
oceans, seas
rivers, lakes
Fill in the blanks:
There is _____ _____ and _____ _____ on the Earth. Salt water is water from _____ and _____. Fresh water is water from _____ and _____. We can only use _____ _____, but there is not much _____ _____ on the Earth.
salt water
fresh water
oceans
seas
rivers
lakes
fresh water
fresh water
Read the words：
salt water fresh water the Earth sea ocean use need a lot of live river lake much important plant animals people sadly waste dirty throw trash save grow only make keep…clean
Do you know:
Why is water important?
People and animals need water to live.
2) Plants need water to grow.
Question: What do people do to waste water? How do people make water dirty?
Question: What do people do to waste water?