A. There will probably be no school on Mars.B. It might take us two or three days to get

问题补充：

A. There will probably be no school on Mars.

B. It might take us two or three days to get to Mars.

C. There is a problem for us to live on Mars.

D. Food will not be the same.

E. First, people will have more space.

Many people believe that, by the year 2100, we will live on the planet Mars(火星). Here is what life could be like.

First of all, transport should be much better. By 2100, spaceship can travel at half the speed of light.【小题1】

Secondly, humans need food, water and air to live. Scientists should be able to find plants that can grow on Mars. These plants will provide us with food and air.

【小题2】We could easily jump too high and fly slowly away into space. To prevent this, humans on Mars have to wear special shoes to make themselves heavier.

Life on Mars will be better in many ways.【小题3】It is possible to live in a large building with many bedrooms. Then, robot will do most of the work, so we have more time for hobbies.

【小题4】Every student can study, do their homework on the computer and take exams in online schools. Each student will also have their own online teacher called “e-teacher”.

However, in some ways, life on Mars may not be better than that on the earth today.【小题5】Meals will probably be in the shape of pills(药片) and will not be as delicious as they are today. Also, space travel will make many people feel ill.B

答案：

(答案→)B

解析：

【主旨大意】本文是一篇科幻题材的文章。文章对人们自2100年的时候，人们的活动空间、交通方式、饮食、居住、求学方式进行大胆的设想。当然也有理性的成分：在火星上生活未必比在地球上好。想象奇特瑰丽，引人入胜。

【小题1】B本段说飞船的速度是光速的一半，花费很短的时间就能到达火星。选B。

【小题1】C第四段讲述了在火星上的困惑：容易失重。

【小题1】E本段介绍入住火星的优势：住的条件大为改善。

【小题1】A 本段介绍学生上学方面的问题，故选A。

【小题1】D根据上下文，讲述在饮食方面存在的差别。