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

First of all, transport should be much better. By 2100, spaceship can travel at half of 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, robots 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 and will not be as delicious as they are today. Also, space travel will make many people feel ill.

根据材料内容，从下面五个选项中选出能填入文中空缺处的最佳选项，使短文意思通顺、内容完整。

A．Food will not be the same.

B．First, people will have more space.

C．There will probably be no schools on Mars.

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

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