1. The identity of hominid remains found in a cave in the Altai Mountains was ______ until Paabo and his colleagues ended the speculation by showing that DNA sequences indicated the bones belonged to Neanderthals.

　　A. extraneous

　　B. conjectural

　　C. improbable

　　D. demonstrable

　　E. consistent

　　【分析】

　　①    两句话逻辑连接词为until(在……以前)引导的时间对比，对比前后取反。

　　②    在Paabo和他的同事结束这个猜测之前，AltaiMountains洞穴中发现的原始人类遗骸的身份是空格的。事后说Paabo和他的同事猜测结束了（endedthe speculation），一件事情能够结束的前提是它必须存在过，开始过。所以空格应该说这个身份依旧是猜测。选B. conjectural (猜测的).

　　【翻译】

　　AltaiMountains洞穴中发现的原始人类遗骸的身份一直都是猜测的，直到Paabo和他的同事通过指出DNA序列说明遗骸是属于Neanderthals而结束了这个猜测。

　　【题源】

　　Theidentity of the mystery ancestor may not be known until DNAassociated with a definitive Homo erectus fossil can be recovered. “Someunknown archaic DNA might have caught a ride through time by living on inDenisovans until we dug the individual up and sequenced it,” commented Prüfer.“It opens up the prospect to study the sequence of an archaic (human lineage)that might be out of reach for DNA sequencing.”

　　——摘自answersingenesis.org

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