TOEFL Reading: ETS-TOEFL阅读机经 - 2334MQ_KE1E534S2L$

According to paragraph 3, all of the following are true of braided streams EXCEPT: A. They shift back and forth on the floodplain as some of their channels fill with sediment and new ones are formed. B. They carry sediments that tend to be very similar in size. C. They sometimes have mid-channel bars. D. Some of their channels are created as a result of the overflow of other channels.