Crows are probably the most frequently met and easily identifiable members o

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问题 Crows are probably the most frequently met and easily identifiable members of the native fauna of the United States. The great number of tales, legends, and myths about these birds indicates that people have been exceptionally interested in them for a long time. On the other hand, when it comes to substantive — particularly behavioral — information, crows are less well known than many comparably common species and, for that matter, not a few quite uncommon ones: the endangered California condor, to cite one obvious example. There are practical reasons for this.
Crows are notoriously poor and aggravating subjects for field research. Keen observers and quick learners, they are astute about the intentions of other creatures, including researchers, and adept at avoiding them. Because they are so numerous, active, and monochromatic, it is difficult to distinguish one crow from another. Bands, radio transmitters, or other identifying devices can be attached to them, but this of course requires catching live crows, which are among the wariest and most untrappable of birds.
Technical difficulties aside, crow research is daunting because the ways of these birds are so complex and various. As preeminent generalists, members of this species ingeniously exploit a great range of habitats and resources, and they’ can quickly adjust to changes in their circumstances. Being so educable, individual birds have markedly different interests and inclinations, strategies and seams. For example, one pet crow learned how to let a dog out of its kennel by pulling the pin on the door. When the dog escaped, the bird went into the kennel and ate its food. [br] Which of the following statements is supported by the passage?

选项 A、Crows have relatively long lives.
B、Crows have keen vision.
C、Crows are usually solitary.
D、Crows are very intelligent.

答案 D

解析文意推断题。选项A：乌鸦有较长的寿命；B：乌鸦视力敏锐；C：乌鸦惯于独居；D：乌鸦智商很高。该题我们采用排除法来处理。选项A，B，c都不能从原文中推出，文中根本没有谈到乌鸦寿命，智力的问题，其寿命，智力等问题和本文的主旨“乌鸦有复杂的特性，故难以研究”没有什么逻辑联系，所以作者根本没有提到这些方面。C项在文中也没有提到。选项D的相关内容可以在文中第3段第2句得出，故D项正确。

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