[单项选择]Many national parks in the west areas of America are among the United States, most treasured natural spaces. From Yellowstone to Yosemite, US national parks stand as monuments to Americans, love of nature and our spiritual connection to the land. They are unparalleled sources of beauty and recreation—but for how much longer Twelve US national parks are at serious risk from the increasing effects of global war ruing and the greenhouse effect, according to a report from the National Resources Defense Council (NRDC) and The Rocky Mountain Climate Organization titled, Losing Ground: Western National Park Endangered by Climate Disruption.
The report shows how global warming in the dry American West, where temperatures have risen twice as fast as in the eastern United States over the past 50 years, is destroying wildlife habitat, putting specie at risk of extinction, and transforming the landscapes and scenic beauty Americans love. If current trend continue, the report says the glacie
A. Objective.
B. Dubious.
C. Neutral.
D. Concerned.

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