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same chemical figerinasa massive voleanic eruption mreyears ago.That relies on the principle that every eruption has a unique chemfingerprint,a unique chemical signature,she said."So when it's possible to analya signature of an ash layer and if it isotd with therefaslaysomhre eeand eow the ag of oe of he depoit（沉积)物，then we canguess indirectly the age of the deposits it's coneted with.Since Omo1as under that Vidal thinks th boneare00years older than previously thought.28.How old is probably Omo 1 according to the new study?A.About 200,000 years old.B.About 33,000 years old.C.About 233,000 years old.D.About 266,000 years old.29.How does the new study date Omo 1?A.By using the C-14 dating technique.B.By dating surrounding things.C.By dating an ash layer thought below.D.By dating an ash layer over.30.What is the key to dating Omo 1 with the new method?A.The chemical fingerprint of the ash.B.The age of the deposits.C.The age of the volcano.D.The layers of the ash.31.Where is the passage most probably taken from?A.A history book.B.A news report.C.A science fiction.D.A travel journal.英语试题（一）第9页（共16页）