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单项选择题
The volcanoes theory cannot convince everyone because______.
A．there are gaps in the volcanoes theory and the time line is not clearly defined
B．modern humans had not yet spread into the heart of Europe
C．modern humans were not as experienced as Neanderthals in coping with natural calamity
D．the population of Neanderthals was much larger than that of modern humans
单项选择题
The geneticists extracted tissue from several different locations in each mummy because______.
A．there was no chance the specimen would be contaminated
B．different research purposes would be fulfilled
C．the tissues would be studied by different scientific groups
D．some of the tissues would be contamination during the process of research
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