单选题River currents tend to（）.Apick up speed where the channel widensBrun slower in the center of the channelChug the inside of a bendDcause the greatest depth of water to be along the outside of a bend
单选题
River currents tend to（）.
A
pick up speed where the channel widens
B
run slower in the center of the channel
C
hug the inside of a bend
D
cause the greatest depth of water to be along the outside of a bend
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