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Honeybees tend to be more ---- than earth bees: the former, unlike the latter, search for food together and signal their individual findings to one another.

单项选择题{{*HTML*}}In the nineteenth century, novelists and unsympathetic travelers portrayed the American West as a land of ---- adversity, whereas promoters and idealists created ---- image of a land of infinite promise.

单项选择题{{*HTML*}}Conservationists have believed that by concentrating their preservation efforts on habitats rich in an easily surveyed group of species, such as birds, they would thereby be preserving areas rich in over- all species diversity. This belief rests on a view that a geographical area rich in one group of species will also be rich in the other groups characteristic of the entire regional climate zone.Which of the following findings about widely scattered tracts 10 kilometers by 10 kilometers in a temperate climate zone would most seriously challenge the conservationists assumptions?