牛津9b unit1 reading 课文 要全!

Moving to Mars迁居火星
At the moment,it may be difficult to imagine,but many people believe that,by the year 2100,we will be living on the planet Mars.Our own planet,Earth,is becoming more and more crowded and polluted.Hopefully,we can start again and build a better world on Mars.Here is what life might be like.
First of all,transport should be much better.At present,our spacecraft are too slow to carry large numbers of people to Mars---- it takes months.However,by the year 2100,the journey might take only a very short time in space shuttles that travels at half the speed of light!
Humans need food,water and air to survive.Scientists should be able to develop plants that can grow on Mars.These plants will produce the food,water and oxygen that we need.However,nobody is sure if these plants can produce enough water.
Gravity will be a problem for the early settlers on Mars.The gravity on Mars is only about three-eighths of that on Earth.This may be dangerous because we could easily jump too high and float away into space.To prevent this,humans on Mars have to wear special boots to make themselves heavier.These boots will probably become very fashionable and there will be many different designs for settlers to choose from.
Compared with life on Earth,life on Mars will be better in many ways.People will have more space.We may even live in a dome with ten bedrooms.Many people believe that robots