7. D 选D DE 依据是第三段的最后一句,即He took Washoe to a research center in Ellensburg, Washington. There, Washoe taught sign language to three younger chimpanzees, which are still alive.
8. E 本文第二段谈到试验的成果时有一个句子:She could request foods like apples and bananas。根据全段意思和上述句子,选择E是正确的。
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