Are we alone in the universe? How can we know if there is life out there in space? Just as the famous scientist Carl Sagan said, “Where there's water, there might be life.” We've searched for water on many other planets, especially on Mars.
In 1877, Schiaparelli watched Mars and noticed some lines. Some people believed the lines could be man-made rivers and life on Mars built them. Then, in 1964, NASA sent Mariner 4 to take photos of Mars. Yet there was nothing to see on the planet, just a cold and dry wasteland.
This didn't stop people's interest. Scientists decided to find out if there was once life on Mars. In 2004, NASA's two rovers(探测器), Spirit and Opportunity, found white lines on rocks from different places on Mars. It showed that perhaps water moved through the ground before. In 2013, another rover, Curiosity, found 2% of water in the soil(土壤) on Mars.
The discoveries were encouraging. However, they were still not enough to show there was life on Mars. These days a Chinese research team opened new doors. After China's Zhurong rover reached Mars on May 22, 2021, the team studied the area around the rover's landing place. They found special layers(层) of rocks. The layers looked a lot like those near the earth's coastlines. This finding has been the biggest so far. It shows there was a sea on Mars a long time ago!
The discovery makes people believe that Mars was once warm, wet and habitable. To make Mars a good place to live again, scientists can study how it changed from warm and wet to cold and dry.
Now, China is planning to send astronauts to Mars. We are the ones who will go on writing the history. Was there life on Mars? What surprising facts will be discovered next? Let's wait and see!
()27. In Paragraph 1, how does the writer show water is important for finding life?
A. He lists numbers.
B. He tells fun science stories.
C. He gives examples.
D. He uses a famous person's words.
()28. Which is the correct order of the findings on Mars since 1877?
①There was once a sea on Mars.
②There was water in the soil on Mars.
③There could be man-made rivers on Mars.
④Maybe water once moved through the ground on Mars.
A. ④③②①
B. ④①③②
C. ③④②①
D. ③①④②
()29. What does the underlined word “habitable” in Paragraph 5 probably mean?
A. Fine to live on.
B. Easy to change.
C. Difficult to land on.
D. Impossible to study.
()30. What's the best title for the text?
A. Mars, Are You Out There?
B. Hello, Is Anyone on Mars?
C. Mars, We Need Water on the Earth!
D. Hello, Let's Visit Mars Again!

27.D 28.C 29.A 30.B

【分析】
本题为英语阅读理解题，需通过定位原文信息、分析上下文语境、梳理时间顺序等方法解题：
1. 第27题：定位第一段，查找作者展示水对生命重要性的方式；
2. 第28题：梳理火星发现的时间线，匹配各发现对应的时间点排序；
3. 第29题：结合第五段上下文语境，猜测划线词含义；
4. 第30题：概括全文核心内容，选择最贴合的标题。
【解析】
1. 第27题：定位第一段，作者引用著名科学家Carl Sagan的话“Where there's water, there might be life.”来体现水对寻找生命的重要性，对应选项D。
2. 第28题：按时间顺序梳理发现：1877年对应③（认为火星有人造河）；2004年对应④（火星曾有水流过地面）；2013年对应②（火星土壤有水）；中国祝融号发现①（火星曾有海），顺序为③④②①，对应选项C。
3. 第29题：第五段提到火星曾是warm、wet的状态，结合“make Mars a good place to live again”，可知habitable意为“适合居住的”，对应选项A。
4. 第30题：全文围绕“火星是否存在生命”展开，选项B“Hello, Is Anyone on Mars?”最贴合主旨，对应选项B。
【答案】
27.D 28.C 29.A 30.B
【知识点】
英语阅读理解、细节理解、词义猜测、主旨大意
【点评】
本题为说明文阅读，围绕火星探索展开，题目侧重考查细节查找、时间梳理、词义猜测和主旨概括，需学生快速定位原文信息，理解上下文逻辑，整体难度适中。
【难度系数】
0.6