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  3. Crows are probably the most frequently met and easily identifiable members of the native fauna of the United States. The great n

Crows are probably the most frequently met and easily identifiable members of the native fauna of the United States. The great n

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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.
What is the main topic of the passage?
选项 A、The ways in which crows differ from other common birds.
B、The myths and legends about crows.
C、The characteristics that make crows difficult to study.
D、The existing methods for investigating crow behavior.
答案C
解析 主旨大意题。  A项：乌鸦有别于其他鸟类的特征：B项：关于乌鸦的神话和传说；C项：使研究乌鸦困难重重的特点；D项：调查乌鸦行为方式的现有方法。第1段中提到：crows are less well known than many comparably common species...There are practical reasons for this. 意思是：人们对乌鸦不甚了解，远不及对其他普通动物种类的了解程度，这种境况的形成是有其实际原因的。而后，在后面几段，作者就展开说明，阐述致使乌鸦与众不同的根本原因，有许多特点和特性使得研究乌鸦着实不易，所以C项正确．A项虽然是文中阐述的一个方面，但不是重点，不是核心，不是中心论述的问题。B项和D项明显离题意很远。
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