Ⅳ. 补全短文。
根据短文内容，从方框中选出能填入空白处的最佳选项。(其中有一项为多余选项)
Many people believe that by the year 2100, we will live on the planet—Mars. Here is what life could be like.
First, transport should be much better. By 2100, spaceships can travel at half the speed of light. 1
Second, humans need food, water and air to live. Scientists should be able to find plants that can grow on Mars. These plants will give us food and air. 2 We could easily jump too high and fly slowly away into space. So humans on Mars have to wear special shoes to make themselves heavy.
Life on Mars will be better in many ways. 3 It is possible to live in a large building with many bedrooms. Then, robots will do most of the work, and we will have more free time.
4 Students can study and take exams online. Each student will have an "e-teacher".
However, life on Mars may not be better in someways. 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.

1.
2.
3.
4.
5.

1. F
2. E
3. D
4. C
5. A

我们可以根据上下文逻辑逐一匹配选项：
1. 空前句提到2100年宇宙飞船能以半光速航行，选项F“我们可能只需要花两三天就能到达火星”是对交通进步带来的便利的补充说明，符合语境。
2. 空前句说明能在火星种植的植物可以提供食物和空气，空后句指出在火星容易跳太高飘进太空的问题，选项E“我们在火星上居住还有一个问题”起到承上启下的作用，衔接自然。
3. 空前句总述火星生活在很多方面会更好，空后介绍可以住带多间卧室的大建筑，选项D“首先，人们会有更多空间”对应后文的“Then（然后）”，是分点介绍优势的第一点，逻辑通顺。
4. 空后句介绍学生在线学习、有电子老师的学习模式，选项C“火星上可能没有学校”和校园学习的内容直接对应，符合语境。
5. 空后句提到火星上的食物是药片形状、不如现在美味，选项A“食物会不一样”是对本段总起句“火星生活在某些方面可能没那么好”的第一个举例，和后文内容匹配。
多余选项为B。