填空题

Wetlands are some of the most biologically productive natural ecosystems in the world, comparable to tropical rain forests and coral reefs in their productivity and the diversity of species they support.

【参考答案】

Y

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Wetlands function like natural tubs or sponges, storing water and slowly releasing it.

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Wetlands can be thought of as biological supermarkets because dead plant leaves and stems break down in the water.