21. In the opening paragraph, the author introduces his topic by

　　A. posing a contrast.

　　B. justifying an assumption.

　　C. making a comparison.

　　D. explaining a phenomenon.

　　22. The statement“it is all too monkey”（Last line, paragraph l）implies that

　　A. monkeys are also outraged by slack rivals.

　　B. resenting unfairness is also monkeys'nature.

　　C. monkeys, like humans, tend to be jealous of each other.

　　D. no animals other than monkeys can develop such emotions.

　　23.Female capuchin monkeys were chosen for the research most probably because they are

　　A. more inclined to weigh what they get.

　　B. attentive to researchers'instructions.

　　C. nice in both appearance and temperament.

　　D. more generous than their male companions

　　24.Dr. Brosnan and Dr. de Waal have eventually found in their study that the monkeys

　　A. prefer grapes to cucumbers.

　　B. can be taught to exchange things.

　　C. will not be co-operative if feeling cheated.

　　D. are unhappy when separated from others.

　　25. What can we infer from the last paragraph？

　　A. Monkeys can be trained to develop social emotions.

　　B. Human indignation evolved from an uncertain source.

　　C. Animals usually show their feelings openly as humans do.

　　D. Cooperation among monkeys remains stable only in the wild.

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