英语四级
A. Oranges.
B. Milk.
C. Tomatoes.
D. Bread.
【解析】题干问在美国什么是人们摄取维生素D的主要来源。短文中提到,在美国,维生素D被添加到牛奶这种大多数人的主要食物中。故选B。 .
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