发源于中国，流经缅甸、老挝、泰国、柬埔寨、越南，注入南海的河流是：     （   ）

A．湄公河

B．伊洛瓦底江

C．红河

D．萨尔温江

According to the "invisible hand" principle, which of the following statements is least accurate（）

A. Competitive markets produce an optimal basket of goods and services.

B. Efficient allocation of productive resources occurs through competition.

C. The authority of the state, although not seen, must always be present in the market.