請依下文回答第 16 題至第 20 題
An endangered species is any plant, animal, or living thing whose ability to live and reproduce has been __16__ by
human activities. Without protection it will be in immediate danger of extinction. __17__ , it will die out completely if
nothing is done to stop the cause of its decline. Habitat __18__ is one of the most important causes of species
endangerment by humans. By destroying forests, __19__ forests and natural grasslands to farms and ranches, draining
wetlands for farmland and __20__ , and polluting marine environments, humans destroy the habitats of many animals
and plants. If its natural habitat is destroyed, a species may not be able to find food or shelter, so it vanishes. 【題組】18 (A) loss (B) cost (C) expansion (D) security
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