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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
参考答案
参考解析
解析：本句意思：在密西西比河的主干流和支流里发现了质量上乘的淡水珍珠。bank的意思 为“银行；河，湖”;delta的意思为“三角洲”;branch的意思为“分支，支流”;current的意思为“洋 流；水流；电流”。tributary的意思为“支流”，和branch的意思接近。
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