单项选择题

"Social mammals" in the second paragraph means "______".

A．our ancestors
B．a kind of ancient human tribe
C．Homo heidelbergensis
D．Neandertals
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单项选择题
Which of the following sentences is tree accord to this article
A．Anthropologists and experts all agree with each other to their findings.
B．Measuring how sound would pass through the model ears is the second step in the research.
C．The fossils from Sima de los Huesos belong to H. heidelbergensis.
D．The fossils from Sima de los Huesos belong to Neandertals.
单项选择题
Which of the following is the best title of this article according to your understanding
A．Anthropologists' Researches.
B．The Vocal Chords of Our Ancestors.
C．The Ears of Our Ancestors.
D．Words of the Distant Past.
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