問題詳情

    Recently, a team of computer scientists at the University of Washington and Microsoft declaredthat DNA molecules can be applied in an archival storage system potentially capable of storing allof the world’s digital information in only approximately nine liters of solution, which is about theamount of liquid in a dozen of wine bottles. The new storage technology would be able to storestaggering amounts of information safely for a millennium or longer, researchers said.    The storage capacity of DNA is colossal compared with even the most advanced electronic ormagnetic storage systems. It would be theoretically possible to contain an exabyte of information, ifit were coded into DNA, in the volume of a grain of sand. An exabyte means the room to store 200million DVDs.    The scientific breakthrough also indicates a new way to store the exploding amount ofcomputer data for centuries rather than just for decades. It means scientists now can finally tackle aglaring Achilles’ heel at the heart of microelectronic data storage systems: Magnetic disks, tape andeven optical storage systems safely store information at most for only a few decades.    But how can information be stored and retrieved in DNA? The basic function of DNA,replication in living organisms, is essential for life. Scientists make use of the self-assembly qualityof biological molecules which encode information. A digitized picture, for example, might bebroken into thousands of pieces that are in turn mapped into thousands of individual strands ofDNA. When they encode the information, the researchers add a unique identifier that makes itpossible to later reassemble the complete picture or file, like putting together a jigsaw puzzle.    It is estimated that the new data-archiving system could spread more widely as soon as fiveyears from now. In the future, it is likely to be used by Hollywood studios and modern hospitals thatneed long-term storage for digitized movies as well as X-ray and M.R.I. images.
27. What is this passage mainly about?
(A) A new way to keep data long and safe.
(B) Great advances in DNA sequencing.
(C) A Hollywood fantasy coming true.
(D) Information in the past found in DNA.

參考答案

答案：A
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)

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