题目选项分析

Found only in the Western Hemisphere and surviving through extremes of climate, hummingbird's range extends from Alaska to Tierra del Fuego, from sea- level rain forests to the edges of Andean snowfields and ice fields at altitudes of 15000 feet.

Found only in the Western Hemisphere, hummingbirds survive through extremes of climate, their range extending from Alaska to Tierra del Fuego, from sea- level rain forests to the edges of Andean snowfields and ice fields at altitudes of 15000 feet.