Wetlands can be thought of as "biological supermarkets" because dead plant leaves and stem
成人英语三级
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Wetlands can be thought of as "biological supermarkets" because dead plant leaves and stems break down in the water.
A．Y
B．N
C．NG
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正确答案：B
解析：文章在“What are wetlands?”一段中指出“Wetlands can be thought of as‘biological supermarkets’．They provide great volumes of food that attract many animal species”：“湿地可以被认为是‘生物超级市场’，它们提供的大量的食物吸引了许多种动物”。前后两句是因果关系。可见，可以被认为是‘生物超级市场’并不是由于枯死的树叶和树干在水里分解的原因。故答案为No。