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observed.More surprisingly,one species spread resin on each other's fur in pairs.In general,the species seemed tospecifically visit the tree to acquire the resin and seemingly benefit from it,either healing their wounds or fightingback parasites(寄生虫).While further studies are needed to identify the properties of the resin and thus confirm that this is indeed self-medication,the use of it suggests that cabreuva represents a common and universal drugstore for the residents ofthe Brazilian Atlantic Forest.It is likely to be a valuable resource helping the species maintain their magnitude byimproving their healthThis discovery could have an important protection influence,as the disappearance of some trees couldpotentially affect the survival of some animals.28.Why do tamarin monkeys rub themselves against the tree?A.They are trying to cure diseases.B.They would like to digest what they eat.C.They feel like occupying the land.D.They are attracting companions'attention.29.What do researchers find through camera-traps?A.Many animals copy monkeys'behaviors.B.Animals can help each other clean the fur.C.The cabreduva is the habitat of tamarin monkeys.D.Resin can be used as medicine for some animals30.What does the underlined word"magnitude"in paragraph 4 probably mean?A.PopulationsB.Characteristics.C.Similarities.D.Flexibilities.31.What is the possible significance of the discovery?A.Promoting evolution of creatures.B.Increasing the production of resin.C.Contributing to forest conservation.D.Motivating the study of monkeys'diet.【答案】28.A29.D30.A31.C【解析】【导语】这是一篇说明文。文章主要说明了研究人员发现动物会使用一种特殊的树树脂作为药物来疗伤。文章解释了研究开展的经过以及发现。【28题详解】细节理解题。根据第二段“During one of these daily studies,tamarin monkeys were observed rubbing theirbodies on the trunk of a tree.At first,researchers thought that they were marking their territory,a commonbehaviour in this species.Botanical experts later confirmed that the tree was a species of cabreuva,which is wellknown for its medical properties.(在其中一项日常研究中，研究人员观察到绢毛猴在树干上摩擦身体。起初，研究人员认为它们是在标记自己的领地，这是这种物种的常见行为。植物学专家后来证实，这棵树是种以其药用特性而闻名的红檀香)”可知，绢毛猴要在树上摩擦自己是为了努力治疗疾病。故选A。