[B] comparing the methods of several research studies on aggression among monkeys.

　　[C] explaining the reasons for researchers interest in monkeys social behavior.

　　[D] discussing the development of investigators theories about aggression among monkeys.

　　2. Which of the following best summarizes the findings reported in the text about the effects of food deprivation on monkeys behavior?

　　[A] Food deprivation has no effect on aggression among monkeys.

　　[B] Food deprivation increases aggression among monkeys because one of the most potent stimuli for eliciting aggression is the competition for incentives.

　　[C] Food deprivation may increase long-term aggression among monkeys in a laboratory setting, but it produces only temporary increase among monkeys in the wild.

　　[D] Food deprivation may temporarily increase aggression among monkeys, but it also leads to a decrease in conflict.

　　3. The text suggests that investigators of monkeys social behavior have been especially interested in aggressive behavior among monkeys because

　　[A] aggression is the most common social behavior among monkeys.

　　[B] successful competition for incentives determines the social order in a monkey group.

　　[C] situation that elicit aggressive behavior can be studied in a laboratory.

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