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重庆大学版（顺序选修）英语6二年级《Theme A Enviromental Protection Environmental Protection Challenging Yourself Saving Our Earth ｜ Saving Water World Environment》优秀教学课件
harmful
adj. 有害的
have a bad influence on
对...有不好的影响
n. 威胁
threat
tackle
v. 处理
Beijing
Las Vegas
is a process that happens when land becomes desert.
With the increasing area of dersertification, peopele should the damage, and start to protect trees.
n. 沙漠化
Dersertification
be aware of
意识到...
take steps to
采取措施做...
Beijing
Las Vegas
Kenya
Water
Listen to the tape, then answer the following questions:
1. How much of the earth's surface is covered with water?
2. Where does fresh water come from?