TOEFL Reading: ETS-TOEFL阅读机经 - 7Z56Z8N461GFD88FL$

According to paragraph 3, which of the following statements is true of cave art? A. The oldest known cave art was created using animal claws in soft clay. B. No works of cave art created on floors remain today because all the examples have been mined by the feet of modem visitors. C. Cave engravings were later followed by prehistoric finger drawings in clay. D. Cave engravers employed different types of rock to create variety and texture.