C
(2025·郑州期末改编)Our solar system has eight planets. They each have something special to make themselves stand out from the others. Today, we will learn some interesting things about Neptune(海王星).
Neptune is the eighth, and the farthest planet from the Sun. It was found in 1846. The planet has long been difficult to study because it is hard to get there and we can't see it with our own eyes.
Now, thanks to the development of science, people know more about Neptune than ever before. It has a beautiful blue colour. It is bigger than our Earth. It is the windiest planet in our solar system. And wind speeds can reach up to about 2,400 kilometres per hour. It takes a very long time, about 165 Earth years for Neptune to go around the Sun for just one time.
There is also another interesting fact about the planet. It could be raining diamonds(钻石) on Neptune! This may sound like something out of a movie, but it is real on this planet. Neptune's atmosphere(大气) has methane(甲烷). Deep within Neptune's atmosphere, there is very high pressure and high temperature. This condition causes methane to change. Then the carbon atoms (碳原子) from the methane get pushed together by the pressure and turn into small diamonds. As they fall, there is diamond rain.
Would you like to see diamond rain on Neptune one day? ▲ Maybe you'll build the next great spaceship and take us there!
()23. Why is it difficult to study Neptune?
①Because it is hard to reach. ②Because it has so many colours.
③Because its atmosphere is too thick. ④Because we can't see it with our own eyes.
A. ①③
B. ①④
C. ②④
D. ③④
()24. What is the main reason for the diamond rain on Neptune?
A. The strong wind on the planet.
B. The methane in its atmosphere.
C. The long travel time around the Sun.
D. The high pressure and high temperature.
()25. What is the best for “▲”?
A. Anything is possible.
B. We can make it a home.
C. Scientists found out why.
D. I want to take a trip there.
()26. What is the main idea of the passage?
A. To ask people to believe in science.
B. To discuss the difficulty of space travel.
C. To compare Neptune with other planets.
D. To tell some interesting facts about Neptune.

【语篇解读】本文是一篇说明文。文章主要介绍了海王星的一些有趣事实。
23 B 细节理解题。根据“The planet has long been difficult to study because it is hard to get there and we can't see it with our own eyes.”可知，因为很难到达那里，我们也无法亲眼看到它，①和④符合。故选 B。
24 D 细节理解题。根据“there is very high pressure and high temperature”可知，钻石雨形成的主要原因是海王星大气内部的高温高压。故选 D。
25 A 补全文章题。根据“Maybe you'll build the next great spaceship and take us there!”可知，这里强调万事皆有可能。故选 A。
26 D 主旨大意题。根据“Today, we will learn some interesting things about Neptune.”可知，文章主要介绍的是海王星的一些有趣事实。故选 D。