2017年6月英语四级考试仔细阅读答案卷三(版)
46 B a shift to city centers
47 C People can enjoy services around the clock
48 C Their parents' bad experience still haunts them
49 D The worsening infrastructure
50 B Hopeful
51 D New information learned pushes old information out
52 C It facilitates our access to relevant information
53 B What contributes to forgetting
54 A It adds to the burden of their memory
55 C It is a way of organising our memories.