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  3. Ecologists have studied the four chipmunk species that occur on the eastern slope of the Sierra and have learned just how these

Ecologists have studied the four chipmunk species that occur on the eastern slope of the Sierra and have learned just how these

admin2014-09-29  31
问题     Ecologists have studied the four chipmunk species that occur on the eastern slope of the Sierra and have learned just how these species interact while remaining separate, each occupying its own elevational zone. The sagebrush chipmunk is found at the lowest elevation, among the sagebrush. The yellow pine chipmunk is common in low to mid-elevations and open conifer forests, including pinon and ponderosa and Jeffrey pine forests. The lodgepole chipmunk is found at higher elevations, among the lodgepoles, firs, and high-elevation pines. The alpine chipmunk is higher still, venturing among the talus slopes, alpine meadows, and high-elevation pines and junipers. Obviously, the ranges of each species overlap. Why don’t sagebrush chipmunks move into the pine zones? Why don’t alpine chipmunks move to lower elevations and share the conifer forests with lodgepole chipmunks?
Where does paragraph 4 indicate that the yellow pine chipmunk can be found in relationship to the other species of the eastern slope of the Sierra?
选项 A、Below the sagebrush chipmunk
B、Above the alpine chipmunk
C、At the same elevation as the sagebrush chipmunk
D、Below the lodgepole chipmunk
答案D
解析
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