完形填空

    Hello, everyone!1 to Class 3. I'm your new English teacher, Mr. Yang. Now let me tell you our class 2. First, you can't be late  3 class. You must 4 on time. Second, you must bring your English books and notebooks to every  5. Third, you must  6 English during the pair work activities. If it's 7 for you, you can ask me for help. Fourth, if you have any  8, you must put up your hands(举手). You can't talk or stand up without permission（未经许可）. These are all the rules. They are good for you, 9 you must follow them. I hope we can have a good 10 every day.

王伦见头势不好，口里叫道：“我的心腹都在那里？”虽有几个身边知心腹的人，本待要来救，见了A这般凶猛头势，谁敢向前。A拿住王伦，骂了一顿，去心窝里只一刀，肐察地搠倒在亭上。可怜王伦做了半世强人，今日死在A之手。（选自《水浒传》）

文中划线处的“A”是谁？他为什么要杀死王伦？

关于在地图上识别方向的一些叙述正确的是（　　）

有关人口密度的叙述，正确的是（    ）