[简答题] I once knew a dog named Newton who has a unique sense of humor. Whenever I tossed out a Frisbee (飞碟) for him to chase, he’’d take off in hot pursuit but then seem to lose track of it. Moving back and forth only a yard or two from the toy, Newton would look all around, even up into the trees. He seemed genuinely puzzled. Finally, I’’d give up and head into the field to help him out. But no sooner would I get within 10 ft. of him than he would run invariably straight over to the Frisbee, grab it and start running like mad, looking over his shoulder with what looked suspiciously like a grin. Just about every pet owner has a story like this and is eager to share it with anyone who will listen. On very short notice, TIME reporters came up with 25 stories about what each is convinced is the smartest pet in the world. Among them: the cat who closes the door behind him when he goes into the bathroom; the cat who uses a toilet instead of a litter box... and flushes it afterward; the do

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