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5. ________ (science)are working hard to make the dream become true.
come
pollution
crowded
Scientists
feel
Revision
objectives
1. To learn some new words and expressions
2. To find the important information from listening material
3. To learn to talk about the advantages and disadvantages of living on Mars
4. To learn to protect the Earth
1. carry out 开展，执行
e.g. No matter what difficulty you will meet with, carry out your plan.?
不管你遇到什么困难，都要执行计划。
The first part:New words
e.g. Percentage of students who would like to move away from the earth is 50%.?
想要搬离地球的学生数的百分比是50%。
2. percentage n.百分数
e.g. The disadvantage of living on Mars。
住在火星的缺点。
3. disadvantage n.缺点，不利条件
4. risk n.风险
e.g. I’m not sure if it’s worth the risk.
我不确信是否它值得这个风险。
e.g. After all, people have already been to the Moon.
毕竟，人们已经去过月球。
5. after all 毕竟
Earth
Mars