Fine freshwater pearls are found in the main stre
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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
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答案:C
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。
