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9B Unit 4 Life on Mars
自主复习：
词组积累：
1.dried food
2.sleeping bag
3.(all) over again
4.at a/ the speed of....
5.connect to/ with
6.compare to/ with
7.carry out
8.after all
9.think about traveling into space
10.by the year 2100
11.the rapid increase in population
12.be of great help to...
13.make sb. feel very ill
14. with the development of technology
15.a guide to (doing) sth
16.large numbers of passengers
17.in the form of...
18.become more and more crowded and polluted
（二）重点句型：
1. How do you like life on Mars?= What do you think of life on Mars?
2. I thought you liked Mars. 我原以为你喜欢火星。
3. Our own planet, the Earth, is becoming more and more crowded and polluted because of the rapid increase in population.
4. It is hoped that people could start all over again and build a better world on Mars.
5. With the development of technology, by the year of 2100, the journey might only take about 20 minutes in space shuttles (that travel at the speed of light.)
6. So far, nobody knows whether there would be enough water or oxygen on Mars for people there.
7. The gravity on Mars is only about three-eighths of that on Earth.
8. Life on Mars would be interesting as well as challenging.
9. It takes Mars about two Earth years to circle around the Sun once.
10. I am not sure if it is worth the risk.
知识疏理与反馈：
（一）知识疏理
语法知识点疏理 (简单句和复合句之间的转换)
状语从句可通过介词短语转换成简单句，定语从句和宾语从句可通过介词转换成简单句。
1. 用介词短语将状语从句转换成简单句。
e.g. (1) The boy can’t come to school because he is ill.
The boy can’t come to school _________ _______ _______ ______.
(2) I can’t work out the maths problem if you don’t help me.
I can’t work out the maths problem ________ ________ ________.
2. 用介词把宾语从句转换成简单句。
e.g. (1) The photo often reminds me that I traveled to the USA ten years ago.
The photo often reminds me ______ my trip to the USA ten years ago.
(2) I am sure that the concert tickets will be expensive.
I am sure ________ the _______ price for the concert tickets.
3. 用介词把定语从句转换成简单句。
e.g. (1) Do you know the woman who
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