企源知识库

The United States grows nearly _____ of the world's grain and supplies a half of all the exports of grain in the world.
A、one third
B、one fourth
C、one sixth
D、one seventh
【正确答案】：B
【题目解析】：美国种植了世界上近四分之一的粮食，提供了世界上一半的粮食出口。