Three friends are talking about their dogs. David says: "My dog is cute and clever (聪明) . Look!" He says to his dog, "Go!" The dog jumps over to a desk, takes out a pencil and draws a perfect (完美) circle. Ben says to his dog "Go!" The dog takes out a bag of biscuits and a bottle of milk. It puts them on the circle. Sam says to his dog "Coffee break." The dog jumps on to the desk and opens the bag of biscuits. It sits on the chair. It divides (分成) the biscuits into four parts (部分) . Then it eats the biscuits and drinks the milk. What a clever dog!
B . 
C . 
