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Unit 4
the Earth
Mars
a better world
crowded
polluted
If it is possible, would you like to live on Mars?
Let’s make a survey!
From the survey, we can know the percentage of the students who want to live on Mars is_________.
百分比
Words and
Expressions
carry out
[p?'sent?d?] percentage
[d?s?d'vɑ?nt?d?]
disadvantage ?
[r?sk]
risk
after all
开展；执行
n. 百分率；百分数
n. 劣势，缺点，不利条件
n. 风险，危险
毕竟
Daniel wants to live on Mars in the future.
However, Sandy is still not sure if she would like to.
This week, there is a TV programme on this topic (话题).
Listen to the preview. Help Sandy make notes of it.
Listening tips:
1. Sometimes, it often reverses the order (颠倒顺序), so we should prepare well before listening.