电子课本网 第121页

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       60 per cent of the students think it's a good idea to move to Mars. First of all, Mars has an environment 
similar to that of the Earth. There is no pollution on Mars. Moreover, life on Mars must be challenging as 
well as interesting. People can start all over again and build a new world on Mars.
       However, 40 per cent of the students hold the opposite opinion. Mars is too far away for spacecraft 
to reach. The journey will be long and uncomfortable. The problems of gravity, food, water and oxygen 
may stop people living on Mars.
       I hope to move to Mars in the future because I want to have some challenging experiences.