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Some people believe humans could live on the planet Mars (火星) by the year 2100. 【小题1】(hopeful), people could start all over again and build【小题2】better world on Mars. Here is【小题3】life there could be like. With the【小题4】(develop) of technology, the journey might only take about 20 minutes by 2100 in spacecraft that travel at the speed of light!【小题5】, the spacecraft would travel so fast that the journey might be quite【小题6】(comfortable). Humans cannot survive 【小题7】water, oxygen (氧气) or food. Nobody【小题8】(know) whether there would be enough water or oxygen on Mars for people there. Gravity could be another problem. The gravity (重力) on Mars【小题9】(be) only about three-eighths (八分之三) of that on the Earth (地球). People would have to wear boots that are specially designed to prevent【小题10】 (them) from floating off into space. Life on Mars would be interesting as well as challenging.

22-23高一下·新疆阿克苏·期末
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