A stretch where the channel changes from one side of the river to the other is called a ______.
选项：

A:A stretch where the channel changes from one side of the river to the other is called a ______.
B:A stretch where the channel changes from one side of the river to the other is called a ______.
C:A stretch where the channel changes from one side of the river to the other is called a ______.
D:A stretch where the channel changes from one side of the river to the other is called a ______.
E:A stretch where the channel changes from one side of the river to the other is called a ______.
F:A stretch where the channel changes from one side of the river to the other is called a ______. G:A stretch where the channel changes from one side of the river to the other is called a ______. H:A stretch where the channel changes from one side of the river to the other is called a ______.