64．The underlined word “dead” in Paragraph 3 means

　　________.

　　$来&源：A．silently

　　B．gradually

　　C．regularly

　　D．completely

　　分析：根据画线词dead所在句子的前一句可知，一些物质使光发散；而本句中的前半句说其他的物质吸收光，根据常识我们可以推知应该是“完全地”阻止光的传播。故正确答案为D项。

　　[课堂巩固训练]

　　A

　　You use her as a shoulder to cry on. She texts you back with casual jokes.But she, Xiaoice, is only a virtual chatbot.

　　Xiaoice, Microsoft's latest artificial intelligence robot, was briefly released in 2014, and returned to WeChat in 2015, where she_became_a_big_hit. Millions of young Chinese now exchange messages with her daily, The New York Times reported. On WeChat,

　　Xiaoice is an official account. After following it, users can start text­based conversations with Xiaoice.

　　“Xiaoice's incredible learning ability was why people loved to talk with her，” Liu Jinchang, a researcher at High­tech Research and Development Center under the Ministry of Science and Technology, told China Daily. Apart from her ability to identify photos and send emojis (表情符号) in conversations, Xiaoice gains 45 percent of her knowledge from interacting with users, China Daily reported.

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