TOEFL Listening: ETS-TOEFL听力机经 - 7X4516FF0YCAXT4DP$

What is the significance of the axheads that the professor discusses? A. They prove that bluestones were transported across Europe. B. They provide evidence that bluestones were not sacred to Bronze Age cultures. C. They may explain how the builders reduced the size of some of the stones that were transported. D. They helped researchers determine the place in the Preseli Hills where the Stonehenge originated.