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【答案】8.C9.D10.A11.C本文是说明文。文章介绍了一些魔术师表演的细节以及有关魔术的小技巧题详解的意图题。通过对文章主旨大意的理解以及文章最后两端讲述的魔术技巧,可知作者写这篇文章的主要的是解释魔法的艺术。故选C项【9题详解细节理解题。通过第二段 Magic shows are entertaining as long as the audience does not discover how the tricksare done.〈只要观众不知道魔术是如何表演的,魔术表演就很有趣The magician must keep peoplefrom noticing all the movements of his hands and from thinking about the secret parts of his equipment. (Rx yip必须防注意到他的手的所有动作和思考他的设备的秘密部分。》可知,对演出保密对于魔术的成艮重要。故选D项【10题详解推理判断题。通过倒数第二段“ For example the magician puts a small ball under one of several cups. The ballthen seems to jump from one cup to another or to change colour例如,魔术师把一个小球放在几个杯子中的面。然后球似乎从一个杯子跳杯子或改变颜色)以及最后一段“ What actually happens is thatthe magician makes the cut or burned object disappear by quickly hiding it while the audience watches somethinelse.(实际发生的是,魔术师通过在观众观看其他东西时迅速隐藏它,使被切割或烧毁的物体消失y可以推在文章最后两段中,作者举了两个例子。故选A【11题详解理判断题。通过文章第一段“ The magician is a specially trained actor:(魔术师是受过专门训练的演员推知,表演魔术需要练习。故选C项
7.已知a∈TSIn a+Sin La则cOs[∠aT4A解析:由题得1-cos2a√3sin La所以√3snza=cos2a,所以tan2ay33,又a∈(-n,-x2’4以2a∈,所以2a=5.06=-πcos 2aT1.故选D答案:D
