[单项选择]Everybody loves a fat pay rise. Yet pleasure at your own can vanish if you learn that a colleague has been given a bigger one. Indeed, if he has a reputation for slacking, you might even be outraged. Such behaviors is regarded as "all too human", with the underlying assumption that other animals would not be capable of this finely developed sense of grievance. But a study by Sarah Bronson and Franks de Wail of Emory University in Atlanta, Georgia, which has just been published in Nature, suggests that it is all too monkey, as well.
The researchers studied the behaviors of female brown capuchin monkeys. They look cute. They are good-natured, co-operative creatures, and they share their food readily. Above all, like their female human counterparts, they tend to pay much closer attention to the value of "goods
and services" than males.
Such characteristics make them perfect candidates for Dr. Bronson’s and Dr. de Waal’s study. The researchers spent two years teaching their m
A. posing a contrast
B. justifying an assumption
C. making a comparison
D. explaining a phenomenon

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