— Your painting really improves a lot.
— I have taken a painting ________ since last year. I find my painting is getting better.
A：secret
B：course
C：discovery
D：market
①文化促进经济的发展
②一方水土、一方文化
③自然环境决定文化
④中华文化源远流长
下列现象中，与静电无关的事（ ）
“肥猪赛大象，就是鼻子短。全社杀一口，足够吃半年”反映的是（ ）
