举一反三
(2026·重庆市巴南区期末)By the year 2100, humans might call Mars their new home. Life there will be very different from life on Earth. Let's see what it could be like.
Firstly, travelling to Mars is very slow now—it can take many months. But by 2100 new and fast spaceships will be able to reach Mars in just two or three days!
Besides, people need food, water and air to live. Mars doesn't have good soil for growing plants like Earth does. But scientists may use special technology to grow plants there. These plants could provide food and clean air for people. Will they also give us enough water? Scientists are still trying to find out.
Lastly,
. The gravity on Mars is much weaker than Earth's. That means people can jump very high and even float away(飘走)! To stay safe, people will need to wear heavy shoes or special suits to help them stay on the ground.
Life on Mars won't be perfect. The food may not taste as good as that on Earth and long space trips can still make people feel sick. Maybe life on Mars won't be better than life here today—it's just very very different.
(
B
)2. Which sentence can be put in the “
”?
A.life on Mars can be quite colourful
B.living on Mars has another challenge
C.it's hard to jump very high on Mars
D.we can't run on Mars
解析：
【分析】首先梳理文章结构，发现全文用“Firstly”“Besides”“Lastly”分点论述火星生活的情况，前两点均围绕火星生活的挑战展开；空缺处位于“Lastly”引导的段落开头，需引出第三个挑战。接着分析选项：A项“火星生活多彩”与后文重力话题无关；B项“在火星生活还有另一个挑战”能承接上文挑战话题，引出本段重力弱的内容；C项“很难跳很高”与后文“能跳很高”矛盾；D项“不能跑”后文未提及，排除后确定答案。
【解析】1. 明确文章逻辑：“Firstly”“Besides”“Lastly”是表顺序的连接词，前两点对应火星生活的两个挑战，空缺处需引出第三个挑战；2. 选项辨析：A项与后文内容无关，排除；B项承接上文挑战，引出本段重力弱的核心，符合逻辑；C项与原文“能跳很高”矛盾，排除；D项无依据，排除；因此选B。
【答案】B
【知识点】语篇结构分析、阅读理解（句子还原）
【点评】本题考查语篇逻辑的理解，解题关键是抓住顺序连接词，明确各段落论述主题，结合上下文逻辑即可快速解答，属于基础题型。
【难度系数】0.7
