Nearly everyone has realized that Microsoft buying Hotmail has illustrated the paradox of Internet. The disadvantage of today’s

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问题 Nearly everyone has realized that Microsoft buying Hotmail has illustrated the paradox of Internet.
The disadvantage of today’s social networks is that to the outside web, they are not ______.

选项

答案open

解析 由题干的today’s social networks和the outside web可以定位到第八段前两句The problem with today’s social networks is that they are often closed to the outside web.The big networks have decided to be "open" toward...此处需要填入名词或形容词来作be的表语。根据文意,现在的社会网络经常是对外网关闭的。题干将原文中的problem改写为disadvantage,注意到题干有否定词not,所以要填入closed的反义词,故答案为open。
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