“打虎拍蝇”、“顶层设计”、“新常态”等反映当下中国政治经济生态的热词，纷纷入选2014年十大流行语。这些热词的出现表明（   ）。

完形填空

    Do you like playing the piano?Now there is a 1  in Sydney called“Play Me，I’m Yours”．People can  2the piano in many places for free．In addition to(除……之外)letting people enjoy beautiful music，the programme  3 helps them communicate(交流)with each other．

    People have placed thirty pianos in  4parts of the city．People can  5 the words“Play Me，I’m Yours”on each piano．People can play music6 sing songs with the pianos．Many people stop to 7  or play happily．

    Now lots of people are 8 in front of computers and busy with their work all day and they have no time to enjoy  9  ．So the programme is to help them relax and make 10  friends．

生命的价值只有在轰轰烈烈的奉献中才能体现，而平凡的人生则无法体现生命的价值。（   ）

三棱锥S﹣ABC及其三视图中的正视图和侧视图如图所示，则棱SB的长为（　　）