一篇简短的阅读理解I was walking in the park with a friend recently,an

一篇简短的阅读理解
I was walking in the park with a friend recently,and his cell phone rang,interrupting our conversation.There they were,talking and talking on a beautifully sunny day and I became invisible,absent from the conversation.
The park was filled with people talking on their cell phones.They were passing other people without looking at them,saying hello,noticing their babies or stopping to pet their puppies.Evidently,the untethered electronic voice is preferable to human contact.
31.Where was I waking according to the passage?
I was walking _________________ with a friend.
32.What interrupted the conversation between the author and her friend?
The ringing of her friend’s _____________________.
33.We may infer (推断) that the author was walking with her friend on a ___________ day.
34.When the author’s friend was talking on the phone,the author became _______ to him.
35.In the last sentence “ the untethered electronic voice” refers to (指) __________.