3. 解析：选D。推理判断题。根据文章最后一段的描述，英语广泛应用于气象和机场的交流，国际会议和信息传播等，可推知此题的答案为D。

　　4. 解析：选B。细节理解题。根据文章第二段最后一句可知，环境不同，所要求的英语水平等级也有所不同，因此很难判断一个人的英语程度。故此题答案为B。

　　A,B,C或D四个选项中，选出最佳选项。

　　Steven Spielberg's 2002 science-fiction thriller Minority Report produced a world where computers could read minds and predict the future. It seemed fanciful at the time, but fantasy is edging closer to fact.

　　On Jan. 3l, a team of scientist sat the UC Berkeley, led by Robert Knight programmed computers to decode (解码) brain waves and replay them as words. Five months earlier, another group of Berkeley scientists showed their colleagues short movies and used computers to play back in color what people saw.

　　These experiments are a big advance from 2006, when a French scientist first replayed images from a human mind, a black-and-white checkerboard pattern. The possibilities are great: a disabled person could “speak”； doctors could access the mind of a patient who fainted; you could rewatch your dreams on an iPad.There are, of course, equally dark side, such as the involuntary take out of　information from the brain.

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