下图为某海域洋流分布示意图，完成1—2题。

1、该海域位于[ ]

A、北半球中低纬度

B、南半球中低纬度

C、北半球中高纬度

D、南半球中高纬度

2、下列叙述正确的是[ ]

A、①处渔场的形成与寒暖流交汇有关

B、②处洋流的形成受东北信风的影响

C、③处洋流对沿岸气候起到增温增湿作用

D、④洋流与另一半球同纬度洋流性质相同

If C is the temperature in degrees Celsins and F is the temperature in degrees Fahrenheit, then the relationship between temperatures on the two scales is expressed by the equation 9C=5(F-32). On a day when the temperature extremes recorded at a certain weather station differed by 45 degrees on the Fahrenheit scale, by how many degrees did the temperature extremes differ on the Celsius scale ？（）

A．

B．13

C．25

D．45

E．81