牛津译林版英语九下unit1lifeonmars(reading)ppt课件内容摘要：
ecial boots We have more space In online schools Food will not be the same transport Spacecraft. Space shuttles. Only a very short time. 1 What vehicle do people use to go to Mars at present? And how long does it take? Months. 2 What vehicle may people use to go to Mars in the future? And how long will it take? Food, water and air 4 What will food on Mars be like? Maybe the food will be in the form of pills. 3 What will scientists do to solve the problems of food, water and air? Scientists will develop plants that can grow on Mars and produce food, water and oxygen. Yes, it is. Because the gravity on Mars is threeeighths of the gravity on Earth. People may jump high easily and float away into space. People should wear special boots to make themselves heavier. 5 Is gravity on Mars a big problem? Why? 6 What may happen th。阅读剩余 0%
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