语篇导读　芝加哥大学的研究者们研发了一种可以在网上写虚假评论的AI系统。本文介绍了这种系统的由来、可能存在的危害等。

　　4．Why do researchers use AI system to write fake reviews on Yelp?

　　A．To press their study at the ACM Conference.

　　B．To replace humans' reviews with AI reviews.

　　C．To make sure that they are not harmful to our life.

　　D．To make a study on AI system's review writing.

　　解析　D　推理判断题。根据第二段可知，该项研究的目的是要看这些系统如何轻易地像人一样写评论以及这种评论会带来多大的破坏性，由此可推断，研究者们的目的是为了对AI系统的评论书写情况进行研究，故选D项。

　　5．According to the text, what do we know about the AI reviews?

　　A．They can be found everywhere.

　　B．They are hardly helpful to our life.

　　C．They can be vital to small businesses.

　　D．They bring us a lot of convenience.

　　解析　C　推理判断题。根据第三段可知，许多小企业依靠网上的评论来提高声誉，从而促进其发展，所以AI系统写的评论对小企业来说很重要，故选C项。

　　6．What does the last paragraph tell us?

　　A．AI reviews were effectively distinguishable.

　　B．AI system was really a help in review writing.

　　C．Restaurants should care for customers' reviews.

　　D．AI reviews were almost as believable as humans'.

　　解析　D　推理判断题。根据最后一段最后两句可知，AI系统写的虚假评论被认为和真正的评论区别很小，前者的识别率是3.15，后者的是3.28，由此可推知，AI系统写的评论几乎和人写的评论一样可信，故选D项。

　　7．What's the author's purpose of writing the text?

　　A．To emphasize the importance of AI studying.

　　B．To predict what the world will be like tomorrow.

　　C．To warn people of the threat AI will possibly make.

　　D．To tell the differences between AI reviews and humans'.

解析　C　写作意图题。文中介绍了AI系统所写的评论可以以假乱真，第四段则讲