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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.  小題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.
小題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.  小題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.
小題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.  小題5:Meals will probably be in the shape of pills(藥片) and will not be as delicious as they are today. Also, space travel will make many people feel ill.

小題1:B
小題1:C
小題1:E
小題1:A
小題1:D

【主旨大意】本文是一篇科幻題材的文章。文章對人們自2100年的時候，人們的活動空間、交通方式、飲食、居住、求學方式進行大膽的設想。當然也有理性的成分：在火星上生活未必比在地球上好。想象奇特瑰麗，引人入勝。
小題1:B本段說飛船的速度是光速的一半，花費很短的時間就能到達火星。選B。
小題1:C第四段講述了在火星上的困惑：容易失重。
小題1:E本段介紹入住火星的優勢：住的條件大為改善。
小題1:A 本段介紹學生上學方面的問題，故選A。
小題1:D根據上下文，講述在飲食方面存在的差別。

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