The emergence of social networks on the Internet is being hailed by some as an innovation(i)______and(ii)______the concept of co

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问题 The emergence of social networks on the Internet is being hailed by some as an innovation(i)______and(ii)______the concept of community; yet others criticize such institutions as (iii)______substitutions for old-fashioned human interactions.

选项

答案A,D,I

解析 The best answer is A, D, and I. The first two choices should be positive. Since the networking sites are described as innovative, "revolutionizing" is the best choice for Blank(i). Likewise, "expanding" also conveys the idea of positive growth and change. The second clause of the sentence contradicts this positive view of social networking sites. Consequently, "inadequate" is the best choice for Blank(iii).
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