阅读下面短文，掌握其大意，然后从每题所给的A、B、C三个选项中选出最佳选项。
Kent Wilson gets up at 5: 00 every morning. He is a dog walker. People 1 him to take their dogs for a walk.
First Kent picks up five dogs from their homes. He takes them to the park in 2 car. The dogs run around and Kent plays games with them. He sometimes takes them to the beach. The dogs love that place, because they like to play in the 3. After an hour, Kent puts the dogs back in his car. He takes each dog home. Then Kent picks up another five dogs. Kent takes 4 dogs for a walk every day—ten in the morning and five in the afternoon. When it is 5 or snowy, Kent still takes dogs for a walk, but he will dry (把……弄干) them with a towel before he takes them home. He 6 each dog when they arrive home. He stays with the dog and watches it eat. He won't 7 until the dog finishes eating.
"This job is very 8 work and doesn't pay very well, but I love it," says Kent. Kent also helps people take care of their pets when they are away. "I 9 to take care of all kinds of pets—cats, birds, mice and fish," says Kent, "but I don't have any pets at home. I'm so busy that I have no 10 to take care of them!"
”的一个必要不充分条件是（ ）