C
Recently，a group of thin-legged robotic dogs are working to carry trash(垃圾) on the narrow and steep(陡峭的) paths of Mount Tai. “Please don't litter! I work very hard every day and I don't want to be too tired，” one robot dog says in a short video. The video has received millions of likes online.

Keeping Mount Tai clean is a big headache. In 2023，there were over 8.6 million visitors and they left nearly 24，000 tons of rubbish behind. As big machines couldn't be used there，the area has depended on porters(挑夫)，also known as tiaoshangong in Chinese，to carry trash up and down the mountain on foot. However，fewer people now want to do this job.
The robotic dogs，also called Unitree B2，are produced by a Chinese technology company in Hangzhou. “The robots can carry up to 120 kilograms and can climb for four to six hours on a single charge(充电),” said Ma，a manager of Mount Tai. In a recent test run，a robotic dog finished the 9.5 kilometre route in just two hours，about twice the speed of a human(人类) climber. The robot has a built-in camera and can monitor things around so that it won't knock into(撞到) tourists.
People had different views on the robots. Some gave a thumb-up to the use of new technology. Others worried that porters would lose their jobs. A few even joked，“Can the dogs carry tourists too?” Ma said，“Robotic dogs are of great help but they cannot fully replace(代替) humans.”
()18. Why are robotic dogs working at Mount Tai?
A. To keep tourists safe.
B. To pick up and carry trash.
C. To make funny videos.
D. To bring more visitors.
()19. Which words best describe the robotic dogs?
①heavy
②fast
③cheap
④safe
A. ①②
B. ①③
C. ②③
D. ②④
()20. Which of the following would Ma most likely agree with?
A. Robotic dogs could carry tourists one day.
B. More porters will be needed in the future.
C. We can't do without humans even with technology.
D. Tourists love the new robotic dogs.
()21. What is the best title for this passage?
A. Robots Are Changing Mount Tai
B. Porters and Robots Work Together on Mount Tai
C. Robotic Dogs Help Clean Mount Tai
D. New Technology Makes Mount Tai Popular

C
【文章大意】本文是一篇说明文，主要介绍了在泰山使用机器人狗帮助清理垃圾的情况。
18. B 细节理解题。根据“Recently, a group of thin-legged robotic dogs are working to carry trash on the narrow and steep paths of Mount Tai.”可知，机器人狗在泰山工作是为了搬运垃圾。故选 B。
19. D 推理判断题。根据“In a recent test run, a robotic dog finished the 9.5 kilometre route in just two hours, about twice the speed of a human climber. The robot has a built-in camera and can monitor things around so that it won't knock into tourists.”可知，机器人狗能够在两小时内完成 9.5 千米的路线，并且不会撞到游客，说明它很快且很安全。故选 D。
20. C 推理判断题。根据“Robotic dogs are of great help but they cannot fully replace humans.”可知，机器人狗很有帮助，但它们不能完全取代人类，由此可知，即使有了技术，人类仍然是必要的。故选 C。
21. C 标题归纳题。本文主要介绍了在泰山使用机器人狗帮助清理垃圾的情况，C 选项“机器人狗帮助清洁泰山”适合作为最佳标题。故选 C。

【分析】
本次是英语阅读理解题，需结合文章内容解答4道选择题：18题考查细节理解，需定位机器人狗在泰山工作的原因；19题考查推理判断，需从文中描述提炼机器人狗的特点；20题考查观点判断，需找到文中负责人Ma的相关表述；21题考查标题归纳，需总结文章核心内容。
【解析】
18. 细节理解题：根据文章第一段“Recently, a group of thin-legged robotic dogs are working to carry trash on the narrow and steep paths of Mount Tai.”可知，机器人狗在泰山工作是为了搬运垃圾，对应选项B。
19. 推理判断题：根据文章第三段“In a recent test run, a robotic dog finished the 9.5 kilometre route in just two hours, about twice the speed of a human climber. The robot has a built-in camera and can monitor things around so that it won't knock into tourists.”可知，机器人狗速度快且不会撞到游客，即安全，对应特点②fast和④safe，故选D。
20. 推理判断题：根据文章第四段Ma的话“Robotic dogs are of great help but they cannot fully replace humans.”可知，即使有技术，也不能完全离开人类，对应选项C。
21. 标题归纳题：文章主要介绍了机器人狗帮助泰山清理垃圾的情况，C选项“Robotic Dogs Help Clean Mount Tai”最贴合主旨，故选C。
【答案】
18.B 19.D 20.C 21.C
【知识点】
英语阅读理解、细节理解题、推理判断题、标题归纳题
【点评】
本文是一篇科技类说明文，围绕泰山使用机器人狗清理垃圾展开，题目侧重考查学生对文章细节的定位、信息的推理判断以及主旨的归纳能力，整体难度适中，需学生仔细研读原文对应内容。
【难度系数】
0.6