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DIf you ask Elon Musk,private space travel could be a reality in the next year,and a self-sustainingcity on Mars is not far off,while my colleagues and I are less concerned with the Starship that will launchpassengers into orbit and more interested in how to feed a potential human settlement on Mars.I'm Kevin Cannon,a planetary scientist.I've been working on a lot of projects related to spaceresources.In our recent paper"Feeding One Million People on Mars,"we modeled a path toward self-sufficiency for one million settlers over the course of 100 Earth years-taking into account caloric intakeper person,imported food in the early years,and necessary basic facilities.If you think about the consumables you would need for humans,you're looking at oxygen,water,construction materials and food.And what we realized is that the food is one of the most challengingthings to produce on the surface of Mars and that it's going to take a lot of processing.In our opinion,people really weren't thinking big enough.The million people,that's kind of an arbitrary figure based on some stuff that Elon Musk has talkedabout for his aspirational goals,so we just chose that as a baseline.For the specific numbers in the study,we took a lot from data on Earth.For example,we looked at how many calories the average person eatsper day and then scaled that based on a person's age and activity level.We had a 50/50 mix of males andfemales and we had an age structure.Of course,children consume less calories than older people.That'sall taken into account in our modeling.What turns out to be the real limiting factor is the amount of land that you require.There's almost noatmosphere,so it's very cold.You have to build an enclosed structure,pressurize it,heat it and light it toprotect against the Martian environment.The more land you have to use to grow food,then the moreconstruction,the more power,etc,are needed.32.What are Kevin and his colleagues most concerned about?A.Building structures on Mars.B.Feeding the settlers on Mars.C.Reducing population on Mars.D.Launching passengers to Mars.33.What does Kevin mean by saying "people really weren't thinking big enough"in Paragraph 3?A.Many more factors should be considered.B.Living on Mars is not a dream for humans.C.The environment of Mars can be transformed.D.We need oxygen,water and construction material.英语试卷（四）第7页（共12页）版权声明：本试卷为华中师范大学出版社正式出版物，版权所有，盗版必究。