单项选择题
A．tries to criticize the false belief in precognitive experiences B．is puzzled by the mysteriousness of precognitive experiences C．provides proof for precognitive experiences D．is haunted by precognitive experiences
A. half-brain sleep has something to do with icy weather B. the mystery of half-brain sleep is close to being solved C. most birds living in cold regions tend to be half sleepers D. half-brain sleep is a phenomenon that could exist among other species
A．waste B．purchase C．earn D．omit