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Fine freshwater pearls are found in the main stream and the tributaries of the Mississippi River.
A:banks
B:deltas
C:branches
D:currents
B:deltas
C:branches
D:currents
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参考解析
解析：本句意思：在密西西比河的干流和支流里人们发现了质量上乘的淡水珍珠。tributary 意思是“支流”，与branch（分支，支流）意思相近。bank银行，岸；delta（河流的）三角洲；current气流，水流，电流。
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