单选题 ______ is a slightly sour thick liquid made from milk with bacteria added to it, sometimes sweetened and flavored with fruit and sometimes eaten plain.
【正确答案】 C
【答案解析】根据句子的描述可知这种食物是酸奶。句意：……是酸酸的、粘稠的液体，由牛奶发酵而成，食用时可以加水果使之变得香甜，也可以原味品尝。Yen日元；Yankee(美国人中的)北方佬；Yoga瑜伽术；Yogurt酸奶。