China exported $2.5 billion of food ______ to the United States and the rest of the world in 2006. A. elements B. components C. substances D. ingredients

China exported $2.5 billion of food ______ to the United States and the rest of the world in 2006.

A. elements  
B. components
C. substances      
D. ingredients

Trả lời

Chọn D

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