A little boy went to a farmer who had some puppies (小狗）to sell and said, “I want to buy one of your puppies.” Then reaching deep into his pocket, he pulled out a handful of change and held it up to the farmer. “I’ve got thirty-nine cents. Is that enough to take a look.”
“Sure,” said the farmer. Then he called his dog, “Here, Dolly!”
Out from the doghouse and down the ramp(斜坡) ran Dolly followed by four little balls of fur. The little boy pressed his face against the chain link fence. His eyes danced with delight.
As the dogs made their way to the fence, the little boy noticed something else moving inside the doghouse. Slowly, another little ball appeared. This one was much smaller than the others. Down the ramp it slid(滑行). Then in a somewhat awkward manner the little pup began hobbling(蹒跚) toward the others, doing its best to catch up…
“I want that one,” the little boy said, pointing to the slow dog.
The farmer knelt down at the boy’s side and said, “Son, you don’t want that puppy. He will never be able to run and play with you like these other dogs will.”
With that the little boy stepped back from the fence, reached down, and began rolling up one leg of trousers. There was a steel brace(支架) running down both sides of his leg. It was joined to a specially made shoe. Looking back up at the farmer, he said, “You see, sir, I don’t run very well myself, and he will need someone who understands.”
The world is full of people who need someone who understands.
It can be inferred that “Dolly” in the passage was _______.

A．a mother dog	B．the little boy’s name
C．the farmer’s son	D．one of the puppies

How many puppies did the farmer have in all?

A．3

B．4

C．5

D．6

The little boy decided to buy the smallest puppy because _______.

A．he was disabled and decided to be a vet (兽医) to cure it

B．he knew the smallest puppy needed understanding and care most

C．he liked puppies that were unable to run fast

D．he didn’t have enough money to buy a different one