1、Unit 4 Life on Mars重点单词：planet行星 crowded拥挤的polluted被污染的 rapid快的，迅速的increase增加 uncomfortable使人不舒服的；不舒适的tasty味道好的 specially专门地，特地compare比较 rapidly快地，迅速地possibility可能性 stranger陌生人，外来者 risk风险，危险重点短语：dried food干粮sleeping bag睡袋（all）over again再；重新at a/the speed of以.的速度in the form of以.的形式compare to/with与.相比
2、be compared with sth.被与某物相比be aware of意识到carry out开展；执行after all毕竟How do you like.?=What do you think of.?你觉得.怎么样？a large number of =large numbers of+名复 大量的large numbers of passengers大量的乘客travel at the speed of light以光的速度旅行three-eights of the gravity on Earth地球引力的八分之三It is hoped that 可以指望in many way
3、s在许多方面increase rapidly迅速地增加one-third/one third三分之一be similar to与相似in agreement意见一致重点句型：1. It is hoped that people could start all over again and build a better world on Mars.人们有望能够在火星上重新开始建设一个更好的世界。2. Here is what life there could be like. 这里描述的是那里的生活可能是什么样子的。3. At present, our spacecraft are too sl
4、ow to carry large numbers of passengers to Marsit would take months. 目前我们的宇宙飞船太慢了，无法运送大批的乘客去火星，因为要花几个月的时间。4. With the development of technology,by the year 2100, the journey might only take about 20 minutes in spacecraft that travel at the speed of light! 随着技术的发展，到2100年，乘坐以光速飞行的宇宙飞船，行程或许只要大约20分钟！5.
5、Food would most probably be in the form of pills and would not be so tasty. 食物很大可能会以药片的形式存在，而且味道没那么可口。6. The gravity on mars is only about three-eighths of that on the Earth. 火星上的重力大约只有地球上的3/8。7. Compared with life on the earth, life on mars would be better in some ways. 与地球上的生活相比，火星上的生活在有些方面要好一些。8.
6、 Every student would have a computer at home connected to an interplanetary network. 每个学生家里都有一台电脑与星际网络连接。9. Life on mars would be interesting as well as challenging. 火星上的生活不仅有挑战性，而且还很有趣。温馨提示：1. 使用状语从句或简单句Neil Armstrong received his student pilots licence when he was 16.Neil Armstrong received his st
7、udent pilots licence at the age of 16.People might float in space because the gravity is low.People might float in space because of the low gravity.Humans cannot survive if there is no food, water or oxygen.Humans may not survive without food, water or oxygen.2. 使用宾语从句或简单句The smell of the pills remi
8、nds them that food on the earth is tasty.The smell of the pills reminds them of the tasty food on the earth.Are they sure that special travel will be very fast?Are they sure about fast speed of space travel?3. 使用定义关系从句或简单句People might live in houses which have huge, comfortable rooms.People might live in houses with huge, comfortable rooms.On mars, you might see people who wear special boots.On mars, you might see people in special boots.
