阅读理解。阅读下列短文, 从给的四个选项 (A、B、C和D) 中, 选出最佳选项。
In presentday China，we can find two types of fast food—western food and Chinese food.However，not until the recent decade has western fast food become popular in China.Before the first hamburger walked its way into the Chinese food market，we had little idea about such terms as hot dogs，pizza，potato chips，let alone KFC and McDonald's.It is the reform and openingup policy that has brought about the interflow of the food culture between China and the western countries.
