OG详解-OG4 阅读 Q28

Choice A is the best answer because it explains how the researchers determined the level of surprise displayed by the cats in the study. The text states that Saho Takagi and colleagues played recordings of the voice of each cat’s owner and measured how surprised the cat was by the recording based on how it moved its ears and head.
Choice B is incorrect because, as the text explains, the recordings played for each cat in the study were of the voice of the cat’s owner, not a stranger’s voice. Choice C is incorrect because the text explains that during the study, the cats didn’t interact directly with their owners; instead, the cats listened to recordings of their owners’ voices. Choice D is incorrect because the text doesn’t indicate that the researchers monitored the cats’ movement around the room in which the study was conducted.