straitford president george friedman says he sees the online world as a kind of mutually reinforcing tool for both information collection and distribution， a spymasters dream. last week his firm was busy vacuuming up data bits from the far corners of the world and predicting a crisis in ukraine.“as soon as that report runs， well suddenly get 500 new internet sign_ups from ukraine，”says friedman， a former political science professor.“and well hear back from some of them.”open_source spying does have its risks， of course， since it can be difficult to tell good information from bad. thats where straitford earns its keep.
it can be learned from paragraph 4 that.
straitfords prediction about ukraine has proved true
straitfords guarantees the truthfulness of its information
straitfords business is characterized by unpredictability
straitford is able to provide fairly reliable information[2003年44题]
but it is hardly inevitable that companies on the web will need to resort to push strategies to make money. the examples of virtual vineyards， amazon.com， and other pioneers show that a web site selling the right kind of products with the right mix of interactivity， hospitality， and security will attract online customers. and the cost of computing power continues to free fall， which is a good sign for any enterprise setting up shop in silicon. people looking back 5 or 10 years from now may well wonder why so few companies took the online plunge.
we learn from the last paragraph that .
pushing information on the web is essential to internet commerce
interactivity， hospitality and security are important to online customers
leading companies began to take the online plunge decades ago
setting up shops in silicon is independent of the cost of computing power[1999年58题]