填空题

Wetlands don’t have any recreational, historical, scientific, and cultural values at all.

【参考答案】

N
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More than half of the United States’threatened and endangered species live only in wetlands, and nearly one-third use wetlands at some point in their lives.
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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.
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