The flatfish are found in almost all seas, but rarely in fresh _

The flatfish are found in almost all seas, but rarely in fresh _________.
A、rain
B、waters
C、flood
D、areas
【正确答案】：B
【题目解析】：fresh water淡水
句意：几乎在所有的海洋中都有比目鱼，但鲜少在淡水中发现。