请用初中化学的相关知识完成下列填空．
数量不一样了，物体就显示带电了。
命题“∀x∈R,x2≥0”的否定为( )
实现全面建成小康社会、建成富强民主文明和谐的社会主义现代化国家，是当下全体中国人民共同的梦想。全国广大青少年，要志存高远，增长知识，锤炼意志，让青春在时代进步中焕发出绚丽的光彩，为中华之崛起而努力。
运用意识的作用和人生价值实现的知识，分析青少年应如何实现人生梦想？
（2015.福建莆田）
Enjoy Harvesting
Want to relax yourself?
Want to experience country life?
Come and pick litchi!
Free for a taste.
Price:￥20 per kilo Dates: July 20th-July 28th
Add: Changlin village Tel:277-8688
Fitness Band on sale
Smartwatches without the watch
Monitor speed, time, distance, caloties burned, etc.
Long battery（电池）life (5 days)
￥800 （20% off for students)
Tel:289-6799
Visit Sam Mall for more information.
Ice and Snow Festival
Charming Ice Carving
Amazing World of Ice and Snow
Welcome to Fenghuang Park!
Dates: July 1st -July 25th
￥20 for each adult (half for each student)
Tel:288-6299
Super Pillow（枕头）Fight Party
Pillow Fight, a popular activity among young foreigners, has now come to Putian. It's a creative way to release(释放) pressure and stress.
Place:Putian Stadium
Time:2:30-5:00pm, June 28th
Fee:￥50 (pillow included)
Tel:275-6588
***在社会主义建设过程中对科学社会主义理论做出了重大贡献。新中国成立后，第一次比较系统地回答了中国社会主义现代化建设的一系列问题的理论是（ ）
