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5.设R，集合，则A.1                B.               C.2              D. 答案：答案:C解析:∵{1,a+b,a}={0, ,b},  ∴a≠0.∴a+b=0.∴=－1.∴a=－1,b=1.∴b－a=2. A series of Chinese landscapes (风景) created by an AI (人工智能) robot, named Gemini, is shown in London.It was believed to be the first AI-made ink work. Ink Now Chairman Calvin Hui sees it as the start of the tech ink times.It took Victor Wong, the Hong Kong artist, around three years to build and program Gemini. He has been interested in traditional art since he was young. "Few younger people nowadays care about ink, so I decided to bring technology and ink art together." says the artist, "I want to tell them that ink painting is not that hard to do."Each landscape painting can take around 60 hours to finish. First, the robot artist creates his own landscape in his AI mind. Then he's traveling inside his mind and picking up an angle (角度) because it's 3D. After that he uses an arm that puts the brush into ink and water before sweeping across Xuan paper to create Chinese Shuimo artwork.However, in some people's opinion, whether robots can create ink art like human artists is not sure because the ink lines were too, straight while works created by human hands are better. "I'm open to all comments," he said, "I'm keeping an open mind as to whether machine-made art can be seen as art. But I hope it will bring an imagination to artists on how to mix technology while painting or creating.【1】The underlined word "it" in the first paragraph refers to ________________.A. GeminiB. the ink workC. Chinese landscapeD. AI【2】Victor Wong decided to bring technology and ink art together because ______________.A. Younger people aren't interested in inkB. younger people know little of AI.C. he wants to build GeminiD. ink painting is not hard【3】According to paragraph 4, Gemini works in the order of _____________________.①sweep across Xuan paper ②put the brush into ink and water③create his landscape ④pick up an angleA. ③②①④B. ③④②①C. ②③④①D. ②①③④【4】The underlined word "comments" means _____________________.A. 想象B. 创造C. 进步D. 评论【5】The purpose (目的) of the passage is mainly to _____________________.A. show us Chinese Shuimo artB. tell the story of Victor WongC. introduce AI ink artD. make Gemini more popular