下列现象包含氧化反应的是 [ ]
A．霓红灯发光
B．食物腐烂
C．盐酸滴在大理石上冒气泡
D．蔗糖溶解在水中
答案：B
事业单位保卫工作主要指对( )等事业单位所进行的保卫工作。
A．文化、教育、科研
B．广播、电视
C．体育、卫生
D．新闻、出版
单句改错。
1. Your friend comes to school is very upset. _________
2. Tell your friend that you are concerning about him. _________
3. While walk the dog, you were careless and it got loose. __________
4. Join the examination and you'll get a chance. __________
5. Yesterday I got my bike repair. __________
