问题
选择题
下列文件中与其它文献性质不同的是 [ ]
A．《 * * 宣言》
B．《权利法案》
C．《人民 * * 》
D．《独立宣言》
答案
C
搜题请搜索小程序“爱下问搜题”
下列文件中与其它文献性质不同的是 [ ]
A．《 * * 宣言》
B．《权利法案》
C．《人民 * * 》
D．《独立宣言》
C
| 完形填空。 | ||||
| Computer games are very popular. It is natural for people to want to 1 , so playing against a computer or against a friend on the computer can be 2 to stop. "Just one more game," often turns into another game, then another. Computer games do have their 3 . They are excellent for training hand / eye coordination (协调). Surgeons (外科医生) who played computer games as children are often more skilled. Computer games can also be great for teaching students. The students are open to learning while playing. They can study for longer than a 4 would be able to teach.Students can also learn at their own speed and not feel pressured to match classmates. And with computers you can 5 a task as many times as you like. The more you do this, the better you will get, until you can do it perfectly. But like anything else in life, things should be balanced. Too much time on the computer can 6 your eyes. Regular breaks are needed. If students cannot 7 playing computer games, they won't do as well in other areas in their life--not just schoolwork, but in developing important social skills such as how to talk with people and how to work with others as part of a 8 . And if they are 9 taking regular exercise,their health will become worse. Computer games have their place, but people must also remember it is important to 10 a balanced lifestyle. | ||||
|
要除去硝酸溶液中混有的少量硝酸钡和硝酸银杂质，而所加试剂只能是酸，据此，请填写下表
| 实验步骤 | 实验现象 | 除何杂质 | 化学方程式 |
| （1）加适量的______ | 生成白色沉淀 | ______ | ______ |
| （2）取第（1）步中过滤后的滤液加适量的______ | ______ | 除去硝酸钡 | ______ |