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  3. The Internet affords anonymity to its users, a blessing to privacy and freedom of speech. But that very anonymity is also behind

The Internet affords anonymity to its users, a blessing to privacy and freedom of speech. But that very anonymity is also behind

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问题     The Internet affords anonymity to its users, a blessing to privacy and freedom of speech. But that very anonymity is also behind the explosion of cyber-crime that has【C1】________across the Web.
    Can privacy be preserved【C2】________bringing safety and security to a world that seems increasingly【C3】________?
    Last month, Howard Schmidt, the nation’s cyber-czar, offered the federal government a【C4】________to make the Web a safer place—a "voluntary trusted identify" system that would be the high-tech【C5】________ of a physical key, a fingerprint and a photo ID card, all rolled【C6】________one. The system might use a smart identity card, or a digital credential【C7】________to a specific computer, and would authenticate users at a range of online services.
    The idea is to【C8】________a federation of private online identify systems. Users could【C9】________which system to join, and only registered users whose identities have been authenticated could navigate those systems. The approach contrasts with one that would require an Internet driver’s license【C10】________by the government.
    Google and Microsoft are among companies that already have these "single sign-on" systems that make it possible for users to【C11】________just once but use many different services.
    【C12】________, the approach would create a "walled garden" in cyberspace with safe "neighborhoods" and bright "streetlights" to establish a sense of a【C13】________community.
    Mr. Schmidt described it as a "voluntary ecosystem" in which "individuals and organizations can complete online transactions with【C14】________, trusting the identities of each other and the identities of infrastructure【C15】________which the transaction runs."
    Still, the administration’s plan has【C16】________privacy rights activists. Some applaud the approach; others are concerned. It seems clear that such a scheme is an initiative push toward what would【C17】________be a compulsory Internet "driver’s license" mentality.
    The plan has also been greeted with【C18】________by some computer security experts, who worry that the "voluntary ecosystem" envisioned by Mr. Schmidt would still leave much of the Internet【C19】________. They argue that all Internet users should be【C20】________to register and identify themselves, in the same way that drivers must be licensed to drive on public roads.
【C11】
选项 A、carry on
B、linger on
C、set in
D、log in
答案D
解析 本填空的动词词组出现在that引导的定语从句中+其先行词为systems，即systems使得用户做出本填空中的动作，而且本动作之后的副词just once说明这个动作只需要做出一次就能使用多种不同的服务；实际上本填空的答案在此前的原文信息中已经出现过(复现)，即上文中的“single sign-on” systems，此处的single与本动词之后的just once是同义重复，因此本填空的动作意思应等同于sign-on。sign-on是“登录”的意思，则本填空答案是D项log in(登录)。A项carry on(继续)和B项linger on(徘徊)与其后的just once无法形成有意义的搭配。而C项set m(嵌入)无法表达登录的意思，本填空动作的主语users也无法做出嵌入的动作。
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