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[填空题]Clattering keyboards may seem the white noise of the modern age, but they betray more information than unwary typists realize. Simply by analyzing audio recordings of keyboard clatter, computer scientists can now reconstruct an accurate transcript of what was typed--including passwords. (41) .
Such snooping is possible because each key produces a characteristic dick, shaped by its position on the keyboard, the vigor and hand position of the typist, and the type of keyboard used. But past attempts to decipher keyboard sounds were only modestly successful, requiring a training session in which the computer matched a known transcript to an audio recording of each key being struck. (42) . Furthermore, each new typist or keyboard required a fresh transcript and training session, limiting the method’s appeal to would-be hackers.
Now, in a blow to acoustic security, Doug Tygar and his colleagues at the University of California, Berkeley, have published details o
[单项选择]Bush officials say the White House may send peaeekeeping troops to ______.
[单项选择]Bush officials say the White House may send peacekeeping troops to ______.
[单项选择]
M: Hello, this is William White. May I speak to Miss Brown
W: I’m sorry, Mr. White. Miss Brown has gone to buy some dictionaries.
Where might Miss Brown go( ).
A. Library.
B. Bookstore.
C. Bank.
[单项选择]Are the British people Europeans This may seem a strange question to Africans and Asians, who tend to think of all white men as Europeans. But the British, when they are in Britain, do not regard themselves as Europeans. The Europeans, to them, are those rather excitable foreigners from the other side of the English Channel, who have never learnt how to speak English. Europe is "the Continent"; a place full of interest for Britain tourists, but also the source of almost all the wars in which Britain has ever been involved. Thus, although geographically speaking Britain is a part of Europe, yet the fact that it is a separate island has made its people feel very, very insular. They feel, and in many ways are, different from the rest of Europe, and they sometimes annoy continental nations by failing to support them, or even to understand them, in time of need.
Where did the British people come from This is an extraordinary interesting question, since they are a mixture of many d
A. isolated
B. sad
C. upset
D. inspired
[单项选择]It may seem an exaggeration to say that ambition is the linchpin of society, holding many of its different elements together, but it is not an exaggeration by much. Remove ambition and the essential elements of society seem to fly apart. Ambition, as opposed to mere fantasizing about desires, implies work and discipline to achieve goals, personal and social, of a kind society cannot survive without. Ambition is intimately connected with family, for men and women not only work partly for their families;husbands and wives are often ambitious for each other, but harbor some of their most eager ambitions for their children. Yet to have a family nowadays-with birth control readily available, and inflation a good economic argument against having children-is nearly an expression of ambition in itself. Ambition and futurity-a sense of building for tomorrow-are inescapable. Working, saving, planning-these, the daily aspects of ambition-have always been the distinguishing marks of a rising middl
A. ambition has increasingly become its domain.
B. ambition has brought about its emergence.
C. its contribution to society has invited jealousy.
D. its pursuit of success in life marks its existence.