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  3. 　　It was the single, strangely spiraled tusk that first alerted scientists. Sticking out of the ice covered by Siberian soil, li

　　It was the single, strangely spiraled tusk that first alerted scientists. Sticking out of the ice covered by Siberian soil, li

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问题 　　It was the single, strangely spiraled tusk that first alerted scientists. Sticking out of the ice covered by Siberian soil, like an ivory tombstone, it revealed the. presence of a true scientific wonder: underneath lay the frozen body of a mammoth.
    The discovery has presented researchers with an unprecedented challenge--to move to laboratory, a mammoth’s entire, undisturbed body where it can be analyzed at leisure and its biological secrets revealed.
    Last week, scientists completed the first stage of this remarkable transfer, using a helicopter to lift a twenty-three-ton block of ice and mammoth to a new site where defrosting can be started.
    As one of the team, Dutch paleontologist Dick Mol put it, "It’s very exciting. I’ve been working on mammoths for more than 25 years, and this is a dream for me—to find the soft parts and touch them and even smell them."
    In particular, the discovery and recovery of the 23,000-year-old body has raised speculation that it may be possible to clone a mammoth from one of its cells. Could the same process used to clone Dolly the sheep be attempted with a mammoth, using an elephant as a surrogate mother?
    It is certainly an enticing prospect. Herds of woolly mammoths grazing the pastures of the world’s many natural parks would be a mighty attraction, and a massive triumph for modem science, showing it could even resurrect eradicated species. Extinction would no longer be forever.
   Mammoths once roamed the world’s northern hemisphere until they abruptly disappeared. Some. scientists argue that as the last Ice Age ended, the world went through major ecological changes, and these large woolly mammals found life awkward, sweaty and unaccommodating. No longer able to compete for resources, they became extinct.  
The word "defrosting" in the third paragraph most probably means
选项 A、becoming unfrozen
B、analyzing
C、researching
D、discovering
答案A
解析
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