The person making the haircut appointment for her boss?She"s not a person There"s a 1 rapidly developing in AI-have it do the things we don"t want to do.Self-driving cars get a lot of attention in this 2.But Google recently demonstrated AI for more 3 tasks.Their system is called Google Duplex--it"s a voice assistant 4 to mimic the ways humans speak to one another.Amazon,Apple and other tech companies also make voice assistants,of course.What"s 5 with Duplex is that it can carry on a conversation 6 as a human being-that is,somewhat awkwardly.And that"s the 7 of course--Google doesnt want Duplex to sound like a machine.In the hair salon 8,the woman who answers the phone throws duplex a curveball There is a point in the exchange 9 Duplex shows its true colors,10.Listen carefully and you"ll hear a11 difference between the Al"s pronunciation of“10A.M.”and“12P.M.”For just an instant,Duplex"s mismatched tones 12 you of being on hold with your bank A second Duplex clip is a bit more 13,because the person 14 the phone doesn"t seem to be 15 paying attention.Duplex tells the woman three times that he wants to 16 on Wednesday Duplex has a long way to go 17 it"ll be ready to handle open-ended conversations on 18 topics.But one day you may be 19 from all kinds of unpleasant vocal interactions.20more time for unpleasant social media interactions
9选？

A. when

B. where

C. why

D. what