2

　　Koko was interested in me, and told me "Visitor good", it is her conversations with Dr Penny Patterson, 18, that are

　　3

　　Patterson was a psychology student when Koko was bom in San Frsndsco zoo in 1971. Language

　　4

　　bad been made using chimpanzees(黑猩猩) before, but

　　5

　　with a gorilla. "At first my expeetation was I'd

　　6

　　with Koko for four years," she says. "But after a few evenings

　　together, I couldn't put her down. I ended up sta- ying with her

　　7

　　she'd fall asleep."

　　When she began

　　8

　　Koko the sign language that deaf--mute people

　　9

　　, forcing the little fingers of the one--year--old gorilla into the

　　10

　　positions for "drink'', "eat'', "more'' and rewarding(资深奖赏) her with

　　11

　　, she had no idea how quickly Koko would

　　12

　　Now Koko is so good at sign language that if she doesn't know a word, she

　　13

　　one. For example, she didn't knowthe word

　　14

　　"ring", so she joined the signs for "finger" and "bracelet" (手镯) to express it.

　　What has been unrecognized by science is that gorillas also have complex emotions (复杂的情感) --Koko was seen in an up set state when she heard her carers

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