Complete the notes below.Write ONE WORD ONLY for each answer.Chimpanzee behavioursSpeciesWe can find Pan or Pan Troglodytes in West and Central Africa.The Bonobo or Pan Paniscus are found in Democratic Republic of Congo.Current researchrule out 1 and biological factorslearn through 2 of other chimps' behaviourDiscoveriesThe book The Third Chimpanzee by James Diamond discusses some physical features of chimpanzees.The discovery reported by Jane Goodall suggests that chimpanzees know how to use 3Chimpanzees in Senegaluse spears sharpened with their teethcan 4 the shell of a coconutuse a 5 hammer to crash nutsare capable of learning 6 and understanding human languageSub-speciesBonobos live on the other side of a 7.Both of them are reducing alarmingly in population 8.
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【正确答案】 1、genetic,    2、observation,    3、tools,    4、open,    5、stone,    6、symbols,    7、river,    8、density    
【答案解析】解析：出题句为“…both of these sub—species have witnessed an alarming decrease in population density…”，这里alarming decrease是reducing alarmingly的同义替换，本题答案为density。