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托?？荚嚾嬖囶}集 托?？荚囶}庫篇一
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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，orother identifying devices can be attached to them ， but this of course requires catching live crows， who 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 is 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， inspanidual birds have markedly different interests and inclinations， strategies and scams。
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。
22。what is the main topic of the passage?
(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
23。 according to the first paragraph， what evidence is there that crows have interested people for a long time?
(a) the large number of stories about crows。
(b) the frequency with which crows are sighted
(c) the amount of research that has been conducted on crows
(d) the ease with which crows are identified
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