TOEFL Reading: ETS-TOEFL阅读机经 - 3V63J1Z3_Y5S5Y6DL$

According to paragraph 1, all of the following provide evidence that the Bonito phase was a time of immense cooperative effort EXCEPT A. the large amounts of material needed B. the size of the Pueblo Bonito complex C. the unusual materials used in construction D. the distance the materials needed to be transported