(2012·宁波)小科看到妈妈炒的一盘紫色高丽菜(一种紫色的卷心菜)的菜汁呈紫色,后来因为掺了醋变成了红色,在洗盘子时遇到碱性洗涤剂变成黄绿色。下列也能使紫色高丽菜汁呈现黄绿色的物质是( )
A:柠檬汁
B:雪碧
C:食盐水
D:肥皂水
Our school is on Guangming Street. It's next to the People's Library. There is a park across from our school. The pay phone is between our school and a post office. Our school is very beautiful. There are many trees and flowers in it. If you want to come to our school from the airport, take a taxi and go down Center Avenue. You can see a big restaurant on your right. There is a bridge near the restaurant. Go across it and turn left. Then go down Bridge Street. Turn left at New Park and go down Guangming Street. Our school is across from a bank.
①任何事物的发展都是前进性和曲折性的统一 ②一切事物都有好的一面和坏的一面
③发挥主观能动性才是做好事情的关键所在 ④矛盾双方在一定的条件下可以相互转化