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  3. After decades of staring at apes, Frans de Waal has written a book about what humans see when they watch chimpanzees. These crea

After decades of staring at apes, Frans de Waal has written a book about what humans see when they watch chimpanzees. These crea

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问题     After decades of staring at apes, Frans de Waal has written a book about what humans see when they watch chimpanzees. These creatures stand on two legs and use arms. They live in social groups, and they share more than 98 percent of their DNA with their human【B1】______. Humans and the great apes had a common ancestor 7 million years ago. So to stare at an ape is to see what might have been a 【B2】______ on the road from yesterday. And when you watch them, do you see them? Or yourself? Humans used to define themselves as【B3】______ because humans used language, made tools and 【B4】______ culture. Then they started looking more closely. They saw that macaque monkeys in Japan learned from each other to wash the sand off their sweet potatoes before they began chewing. Chimpanzees can put the world’s【B5】______ nut onto a hard surface, pound it with a stone and finish the job by poking out tiny bits of kernel with a stick. One group of scientists in 1999 counted 39 different behavior【B6】______ among separate groups of chimpanzees. That is, table manners and working practices differed according to geography. When you watch the great apes, it should be your obvious position to assume that apes【B7】______ humans. Who says that when a chimp looks thoughtful, it isn’t thinking? De Waal’s chimps live in a social group. They can rate what they saw as sad or happy, and they 【B8】______ doing that without previous training. There are ways of understanding how chimps 【B9】______ the world. In the field, people have seen them using leaves as an umbrella or 【B10】______ their backsides with a piece of wood.
【B7】
选项
答案are similar to
解析 这里缺少谓语。be similar to是常用短语，意思是“类似，与……相似”。根据apes可以判断系动词为are。
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