What does the passage mainly discuss?( )
A.Mechanisms for safer navigation. B.The economic structure of the marketplace. C.A specific group of commodities. D.The advantages of lowering taxes.正确答案C
What does the passage mainly discuss?( )
A.Mechanisms for safer navigation. B.The economic structure of the marketplace. C.A specific group of commodities. D.The advantages of lowering taxes.正确答案C