我国下列河流中，唯一流入北冰洋的是：

A．雅鲁藏布江

B．长江

C．黄河

D．额尔齐斯河

Which is the summer load waterline on the load waterline mark?（）.

A.The first line at the bottom

B.The second line from the bottom

C.The third line from the bottom

D.The fourth line from the bottom