单项选择题

The Three Mile Island accident was a core ______, caused by a combination of design and operator errors, of the Three Mile Island Nuclear Generating Station in Pennsylvania, United States in 1979. A. meltdown B. explosion C. blowup D. malfunction

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羽状水系的支流自上游向下游在不同地点依次汇入干流，形成的流域形状多为狭长型。

答案：正确

单项选择题

Suppose that Mexico and Canada form a free-trade area. The Mexicans then decrease refrigerator manufacturing and increase imports of refrigerators from Canada, while the Canadians decrease auto manufacturing and import more autos from Mexico. This is an example of trade creation. ( )