Question 36. The story as a whole is about....................

Dogs are smarter than most other animals. Here is how one man showed that a dog is smarter than a chieken.
He made a long wire cage. He left one end open. He put some food outSide the closed end.
Inside the cage, the man placed a chicken. The chicken saw the food. It ran to get some. But the wire was in the way. The chicken just stayed there, trying to get the food.
Then, the man put in a dog. It sniffed the food through the wire. lt ran back to the open end. It went around the cage and ate the food.
Which was smarter, the chicken or the dog?
Notes: wire: dây/ lưới kim loại; to sniff: đánh hơi