◎ 题干
After years of careful observation in the wild, Jane Goodall was finally able to _____ the social
system of chimps. 
[     ]
A. carry out          
B. work out          
C. look out          
D. pick out
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“After years of careful observation in the wild, Jane Goodall was finally able to _____ the social system of chimps.[ ]A. carry out B. work outC. look out D.…”主要考查了你对  【动词短语】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。