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 (1)_____ across the Web.

    Can privacy be preserved (2)_____ bringing safety and security to a world that seems increasingly (3)_____?

    Last month, Howard Schmidt, the nation’s cyber-czar, offered the federal government a (4)_____ to make the Web a safer place—a “voluntary trusted identity” system that would be the high-tech (5)_____ of a physical key, a fingerprint and a photo ID card, all rolled (6)_____ one. The system might use a smart identity card, or a digital credential (7)_____ to a specific computer, and would authenticate users at a range of online services.

    The idea is to (8)_____ a federation of private online identity systems. Users could (9)_____ 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 (10)_____ by the government.

    Google and Microsoft are among companies that already have these “single sign-on” systems that make it possible for users to (11)_____ just once but use many different services.

    (12)_____ , the approach would create a “walled garden” in cyberspace, with safe “neighborhoods” and bright “streetlights” to establish a sense of a (13)_____ community.

    Mr. Schmidt described it as a “voluntary ecosystem” in which “individuals and organizations can complete online transactions with (14)_____, trusting the identities of each other and the identities of the infrastructure (15)_____ which the transaction runs”.

    Still, the administration’s plan has (16)_____ privacy rights activists. Some applaud the approach; others are concerned. It seems clear that such a scheme is an initiative push toward what would (17)_____ be a compulsory Internet “driver’s license” mentality.

    The plan has also been greeted with (18)_____ by some computer security experts, who worry that the “voluntary ecosystem” envisioned by Mr. Schmidt would still leave much of the Internet (19)_____. They argue that all Internet users should be (20)_____ to register and identify themselves, in the same way that drivers must be licensed to drive on public roads.

答案精析：从后文的in the same way可知，网络用户注册和身份验证应该和公路上的司机一样，而司机必须拥有驾照才能驾车，所以网络用户应该被强制性地进行注册和验证身份，故D选项为正确答案。

错项排除：A、C选项语气过于委婉，与原文中must不符，故错误。注册和验证身份与职位无关，B选项appointed表示任命某人做某项工作或出任某个职位，不符合语境，故错误。

长难句分析：They argue that all Internet users should be forced to register and identify themselves, in the same way that drivers must be licensed to drive on public roads.

本句主干为They argue that …，为主谓宾结构，其中宾语为that引导的宾语从句，宾语从句为主谓结构，使用了被动语态，不定式to register and identify themselves为主语补足语，in the same way是方式状语，其后的that引导的定语从句修饰way。

句意为：他们认为，所有互联网用户都必须被强令注册并验证身份，就像司机必须要拥有驾照才能在公路上开车一样。