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clouds. When the vapour cools, it bees small drops of water. Then the small drops of water bees too heavy to stay in the air. Finally, rain falls. Discuss 1. Where does rain e from? 2. What makes water rise from the sea? 3. How can cloud bee rain? 4. What does water form in the sky? 根據(jù)實(shí)際情況回答下列問題。 1. How can we save more water, by having a bath or taking a shower? 2. Can we drink all the water on Earth? 3. What can you do to save more water at your home? 4. Which is more useful to us, coca cola or water? 5. How many glasses of water do we need every day? Did you know? How to write an experiment?(格式 ) 1. 多用無主語的祈使句。 2. 常用表示時(shí)間先后順序的序數(shù)詞或時(shí)間副詞。 Add some salt to… Heat the water. First, …