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1、火星上的生活 1.我们的行星地球正变得越来越拥挤，越来越受污染；我们可望重新开始，在火星上建立一个更好的家园； 2.首先，交通应当好得多；很快，航天飞机的速度将达到光速的一半； 3.人类要生存，就需要食物.水和空气；科学家希望使植物发展，能在火星上种植，以产生我们需要的食物和氧气；但是，还不能确定它们是否能产生水； 4。

2、火星上的重力只相当于地球上的3/8，人们在火星上得穿上特制的靴子，以增加重量。

3、 Our own planet,Earth,is becoming more and more crowded and polluted.Hopefully,we can start again and build a better world on Mars.First of all,transport should be much ***.In a very short time,space shuttles will travel at half speed of light.Humans meed food,water and air to survive.Scientists hope to plants that can grow on Mars.These plants will produce the food and oxygen that we need.However,it is not certain if these plants will be able to produce water .The gravity on Mars is only about three-eights of the gravity on Earth.Humans on Mars would have to wear special boots to make themselves heavir. 希望采纳，(*^__^*) 嘻嘻。

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