体育比赛中运动员一旦受伤，医生会对着受伤部位喷射一种叫氯乙烷的药液，该药液会在皮肤表面迅速汽化，使受伤部位表层骤然变冷而暂时失去痛感．这说明氯乙烷具有较低的（  ）

B

    Mike works very long hours every day. He usually gets up at 17:00. He has a shower and makes his breakfast. What a funny time to make breakfast! After breakfast, he practices (练习) his guitar for ten minutes, then he puts on his jacket and goes to work. To get to work, he takes the No.17 bus to the Star Hotel. The bus usually leaves at 19:15. He works all night. People love to listen to him! He gets home at 7:00, and he watches the early morning news on TV. He goes to bed at 8:30, a tired but happy man. Can you think what his job is?

现代著名史学家郭沫若说：“书籍被烧残，其实还在其次，春秋末年以来，蓬蓬勃勃的自由思索的那种精神，事实上因此而遭受了一次致命的打击。”
（1）书籍被烧指的是什么事？ 这件事是秦始皇采纳谁的建议而实行的？
（2）秦始皇采取这种行动的目的是什么？
（3）你如何看待这件事？
（4）秦朝时北方最宏伟的国防工程是什么？
（5）秦始皇建立的中央集权的封建国家把哪家的思想主张变成了现实？

下列图中有“高原大陆”、“热带大陆”、“富饶大陆”美称的大洲是（    ）

（2016•江苏）2016 年1 月24 日,一股强大的寒潮影响我国。图3为该日8 时亚洲部分地区海平面气压形势图。该日上海气温比成都低的原因是（    ）