TOEFL Reading: ETS-TOEFL阅读机经 - UB_O14TZ6U35RU17L$

According to paragraph 4, all of the following are true of the playback experiments EXCEPT: A. Female frogs and predator bats approached the broadcasting speakers. B. The bats responded more strongly to the whine-chuck calls than they responded to the whine calls. C. Each speaker played a different kind of male frog call. D. The same experiment was repeated at different locations.