C
Astronauts on Shenzhou ⅩⅧ took four fish to China's space station Tiangong. They were living in a closed fish tank(鱼缸） with some plants. It was the first time fish had lived for a long time—43 days—in such a closed ecosystem(生态系统). In this ecosystem, the plants made oxygen for the fish and the fish's waste gave the plants food.
At the station, astronauts collected water samples(样本), fed the fish with a special tool, and watched them swim in different ways, such as upside down and circling in the special environment, according to Sun Yonghua, director of the China Fishery Resources Centre.
“At first, they appeared not to be moving and stayed where they were in the water for a long time,” said Li Guangsu, one astronaut on Shenzhou ⅩⅧ. “After several days, we found them more active, and they seemed to be in good control of their movements. We thought, ‘The fish also need some time to get used to the space environment’.”
Sending fish into space was the first time China kept animals with backbones in space for many days. This helps scientists learn more about fish and health in space and is meaningful for humans staying in space for a long time.
()23. Why were plants put in the tank?
A. To give food to fish.
B. To keep the water warm.
C. To make the tank pretty.
D. To provide air for the fish.
()24. What did the astronauts need to do?
A. Water the plants.
B. Offer food to the fish.
C. Collect fish waste.
D. Change the water in the tank.
( )25. How did the fish act at the beginning in the space station?
A. They were very active.
B. They didn't swim much.
C. They slept all the time.
D. They didn't eat anything.
()26. Which of the following is the best title for the passage?
A. The Heaven for Fish
B. Learning Science with Fish
C. Keeping Fish in Space
D. The Daily Life of Astronauts
D

23.D 24.B 25.B 26.C

【分析】
做这篇英语阅读理解题时，需先通读全文把握核心内容（神舟十八号航天员在天宫空间站开展封闭生态系统养鱼实验），再针对每个问题回到原文定位关键信息，对比选项选出正确答案。
【解析】
23题：定位原文第一段“In this ecosystem, the plants made oxygen for the fish”，可知植物为鱼提供氧气，对应选项D（provide air for the fish），故选D。
24题：定位原文第二段“astronauts collected water samples(样本), fed the fish with a special tool”，可知宇航员需要给鱼喂食，对应选项B，故选B。
25题：定位原文第三段“At first, they appeared not to be moving and stayed where they were in the water for a long time”，可知鱼一开始不怎么游动，对应选项B，故选B。
26题：全文围绕“在太空养鱼”这一核心事件展开，A选项“鱼的天堂”、B选项“用鱼学科学”、D选项“宇航员的日常生活”均偏离主旨，C选项“Keeping Fish in Space”最贴合，故选C。
【答案】
23.D 24.B 25.B 26.C
【知识点】
英语阅读理解、细节理解题、主旨大意题
【点评】
本题是关于中国太空养鱼的英语阅读理解题，侧重考查学生快速定位原文信息、理解文章主旨的能力，题目难度适中，需学生仔细阅读原文对应内容。
【难度系数】
0.7

Historically, people explored the ocean to find new ways to travel around the world or to start new trade ways. Today, we pay more attention to the ocean itself in the ocean exploration.
In recent years, new technology has made it easier to dive(潜水) into the deep sea. Better submarines(潜艇), robots and cameras now allow scientists to explore areas people couldn't reach before. China's Mengxiang deep-ocean drilling vessel(大洋钻探船) can now be added to the list.
Believe it or not, we know more about space than we do about the deep sea. Since 1969, only three people have dived to the Mariana Trench's deepest point. Even more shocking? Although the ocean covers about 71% of Earth's surface, 95% of it is unexplored.
Why does so much of the ocean remain unknown? Part of the reason is that it's difficult to explore. Sure, it's hard to get a spaceship into space. But remember that in space, you can see things. The deep sea, however, is hopelessly dark. Getting a light down there that can shine far enough is no easy task.
That being said, ocean exploration is worth the risk and cost. The ocean is connected to all of us and plays a role in everything from the air we breathe, the food we eat and the transportation of the goods we buy to weather and longer-term climate trends(趋势). The deep ocean also holds huge amounts of oil, gas, metals and so on.
()27. Why didn't scientists reach the deep sea in the past?
A. They didn't think it was worth the risk.
B. They didn't have high-level technology.
C. They thought there was no need to do it.
D. They wanted the knowledge from shallower waters.
()28. What can we learn from Paragraph 2?
A. Mengxiang deep-ocean drilling vessel is popular with tourists.
B. Mengxiang deep-ocean drilling vessel is mainly used for trade.
C. China has made great progress in ocean exploration technology.
D. China is the first country to explore shallower and deeper waters.
()29. What does the underlined word "task" refer to?
A. Inventing a new light.
B. Seeing the things in space.
C. Getting a spaceship into space.
D. Sending a bright enough light down.
()30. What can we get from passage?
A. Deep ocean exploration is important and necessary.
B. The ocean influences the long-term climate trends most.
C. We have explored most of the resources in the deep waters.
D. The ocean coverage is large and we have explored most of it.

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

【分析】
27题：题干询问过去科学家无法到达深海的原因，需定位原文对应信息。第二段首句提到“新技术让深海潜水更易”，反推过去因缺乏高科技难以实现，对应选项B。
28题：要求从第二段提取信息，第二段核心是新技术推动深海探索，中国“梦想号”大洋钻探船加入，体现中国深海技术进步，对应选项C。
29题：词义猜测题，定位画线词所在句，结合前文“深海一片漆黑”，可知“task”指“把足够亮的光送到深海”，对应选项D。
30题：需结合全文主旨，最后一段强调深海探索与空气、食物、气候等密切相关，值得投入，说明其重要性，对应选项A。
【解析】
27题：根据第二段“new technology has made it easier to dive into the deep sea”，可知过去深海探索困难是因为缺乏高科技，故选B。
28题：第二段讲述新技术助力深海探索，中国“梦想号”大洋钻探船加入，体现中国在深海探索技术上取得进步，故选C。
29题：画线词所在句意为“把足够亮的光送到深海不是容易的任务”，结合前文深海黑暗的描述，“task”指代“把足够亮的光送到深海”，故选D。
30题：最后一段指出深海探索与空气、食物、气候等密切相关，值得投入，说明其重要且必要，故选A。
【答案】
27.B 28.C 29.D 30.A
【知识点】
英语阅读理解（细节理解题、词义猜测题、主旨大意题）
【点评】
本篇为海洋探索主题的英语阅读理解，主要考察学生快速定位原文信息、词义猜测及主旨理解的能力，题目难度适中，需结合原文细节逐一分析选项。
【难度系数】
0.6