C．How hard Robot Turtles is to use.

　　D．How to use Robot Turtles in the classroom.

　　解析　B　主旨大意题。根据第二段可知，这一段主要介绍了这款游戏是怎样操作的，故选B项。

　　3．How is the game to kids?

　　A．Easy． B．Cheap.

　　C．Difficult． D．Expensive.

　　解析　A　细节理解题。根据第三段、第四段和第五段中的Robot Turtles would be an easy way for kids in kindergarten可知，这款游戏对孩子们来说是很容易的，故选A项。

　　B

课标话题 人与社会·科技发展与信息技术创新 体裁 说明文 词 数 268 难度 　　(2019·山东胜利一中质检)Researchers at the University of Chicago have trained an artificial intelligence(AI) system to write fake(伪造的) reviews on Yelp, a website showing customers' reviews on shopping or something else, and it's pretty hard to tell them apart from a human review.

　　Their study, which will be presented at the ACM Conference on Computer and Communications Security in October, aimed to stress how easily these systems can write reviews like humans and how damaging they can become if they're not mentioned properly.

　　Since many small businesses rely on online reviews to help grow and support their reputation, a future where someone-like a competitor or angry customer-could crazily fill their page with bad reviews written by a machine is pretty worrying.

　　And, according to the research team, the threat goes far beyond a bunch of fake reviews on Yelp. "In general, the threat is bigger，" Ben Y．Zhao, one of the authors of the study, said. "I think the threat toward society is large and it really misleads users and shakes our belief in what is real and what is not. I think that's going to be even more unimaginable."

To test how believable these reviews came across, the researchers invited 40 volunteers and had AI generate(生成) five fake reviews for 40 actual restaurants. The volunteers were asked how useful they thought the reviews were and whether or not they thought they were fake. The AI reviews ranked as "effectively indistinguishable" from real reviews, according to the study. Further, the fake reviews were given a 3.15 "usefulness" rating, compared to a 3.28 rating for human reviews.