A:生产的发展推动消费的发展
B:消费对生产具有重要的反作用
C:生产为消费创造动力
D:物质资料生产是人类生存与发展的基础
用所给动词的正确形式填空。
I____(not know) him two years ago.
When it is fine tomorrow, we____ (go) to the park.
Peter____ (not go) to school yesterday because he ____(be) ill.
When Linda ____ (be) young, she danced very well.
在三角形ABC中,A=150°,则3sinA-cosB+C的值为( )