The four-million-year-old fossilized skeleton known as Lucy is so small compared with many other skeletons presumed to be of the same species, and so some paleontologists have argued that Lucy represents a different lineage.
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Apresumed to be of the same species, and so
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Bpresumed to be of the same species that
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Cpresumed that they are of the same species, and so
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Dthat they have presumed to be of the same species, so that
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Ethat they have presumed are of the same species, and
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正确答案: B