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刷刷题刷刷变学霸
举一反三
【单选题】Passage Five Concern about individual privacy on the Internet has been rising. E-commerce continues to grow, but many online shoppers are concerned about how their personal information is being or mig...
A.
Of particles with extremely short lifetimes.
B.
Nearly as described but not completely.
C.
Not physically existing but produced by a computer.
D.
Of points where rays meet if produced backward.