TOEFL Reading: ETS-TOEFL阅读机经 - 5O873T54X2I63N56L$

According to paragraph 4, all of the following were true of totem poles EXCEPT: A. Each was made from a single tree. B. They sometimes featured images of animals thought to provide protection against harm. C. Larger numbers began to be made after metal tools became increasingly available. D. Their decorative designs became more complex over time.