单项选择题

"Somebody" in "somebody released some tigers" in Para. 5 refers specifically to ______.

A．Internet providers
B．Internet users
C．routers
D．hackers
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单项选择题
The author means ______ by whole persons in Para. 1.
A．persons of beauty
B．persons of virtue
C．persons of excellence
D．none of the above
单项选择题
At the end of the article, the author seems to suggest ______.
A．there is no solution to the flaw in the Internet technology
B．there is much worry within the academic circle about Internet security
C．US government is indifferent to the hacker attacks
D．Internet traffic is easily vulnerable to hack attacks
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