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关注自然资源的现状，倡导学生保护环境，节约用水。
二、The key points and difficult points（重难点）
1. Key points:
Words ：void, discover, thirsty, nearly, law, shortage, resource, reuse,
Prases：tke sth. away from…, the shortage of water / water shortage, avoid (doing) sth., make progress in, nearly 3/4 of…
2. Difficult points：
学会归纳话题中的重点语法和表达法(wh-questions)
三、Teaching process教学过程
Step 1: Review复习
不定代词和副词（Indefinite pronoun and adverb）的基本用法
1.Could you give me__ to eat?
2.__who breaks the rules will be punished
3.Everyone__(be)here today
Step 2: Check the preview 预习检测
1.Fill in the blanks
_______of us likes pollution. Don’t spit ___________ in public. _________ should care for wild animals and plant more trees. We should do ___________ we can to protect the environment.
2.Change into English
（1）______ a result（结果）, a lot of rich land has changed _________ （变为）desert.
（2）Trees can stop the wind from ______ the earth _____(吹走）.
（3）We shouldn’t leave rubbish ___________(到处).
（4）All these problems are very serious,_____(所以) we must do something now.
3.Speak Chinese
(1)even thirstier
(2)be covered with
(3)be short of/water shortage/ the shortage of
(4)avoid doing sth
(5)make some progress
(6)day by day
(7) enough/reuse/fresh/sea/plenty of water
(8)seem to do sth