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  3. The most aggressive of the four eastern-slope species is the lodgepole chipm

The most aggressive of the four eastern-slope species is the lodgepole chipm

游客2025-02-06  39
问题     The most aggressive of the four eastern-slope species is the lodgepole chipmunk, a feisty rodent indeed. It actively prevents alpine chipmunks from moving downslope, and yellow pine chipmunks from moving upslope. There is logic behind the lodge-pole’s aggressive demeanor. It lives in the cool, shaded conifer forests, and of the four species, it is the least able to tolerate heat stress. It is, in other words, the species of the strictest habitat needs: it simply must be in those shaded forests. However, if it shared its habitat with alpine and yellow pine chipmunks, either or both of these species might outcompete it, taking most of the available food. Such a competition could effectively eliminate lodgepole chipmunks from the habitat. Lodgepoles survive only by virtue of their aggression. [br] The phrase "by virtue of" in the passage is closest in meaning to
选项 A、in spite of
B、because of
C、unconcerned about
D、with attention to
答案 B
解析
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