阅读下面短文，从短文后各题所给四个选项（A、B、C和D）中，选出可以填入空白处的最佳选项。
My great-grand mother, Winifred Hastings, got rich in a mining（采矿）town out West. But her 1 didn't come from gold or silver, but from soup, steak, apple pie, and good coffee.
In the early 1900's, Winifred arrived in Silver City with her husband. But he caught a fever and died suddenly. With the little money she had, Winifred decided to open a practical restaurant to 2 all the hungry miners in town.
The restaurant had only wooden boxes for tables, but business was very good 3. The miners 4 that Winifred was a great cook, 5 they ate in her restaurant every day.
One time, Winifred had a small accident in the restaurant. A fire started in the kitchen and her customers had to put it out. The town mayor walked in 6 there was still a lot of smoke in the room. “Winifred,” he said. “What are you cooking back there?” Everybody 7.
In 1905, Winifred got married again and moved out of town. On her 8 day in Sliver City, a photographer took her picture. The picture is over my desk at home. It shows Winifred with about fifty miners standing in front of the restaurant. At the top of the photo 9 says: TO WINIFRED THE BEST COOK IN THE WEST. 10 YOUR BOYS.
), B(－a, －b)在函数
的图象上, 那么称
关于原点的中心对称点的组数为 ( )