下图中A1和A2为某商品的供给曲线(P为价格,Q为数量),假设该商品需求曲线A3不变,当该商品供给曲线从A2左移到A1时,市场可能出现的情况有( )。
①商品供过于求,价格下跌
②该商品供不应求,价格上涨
③该商品的替代商品需求减少
④该商品的互补商品需求减少
A:①④
B:②④
C:①③
D:②③
在①y=2x﹣1;②y=﹣ax;③y=5x﹣3;④y=15x中,y是x的反比例函数的有____(填序号).
A: Excuse me! ____
B: Yes. Please keep your desk clean.
A: ____
C: Wow! Your picture is so beautiful!
B: ____
C: Oh, I'm sorry. ____
B: Sure!
C: ____
B: Yes, work quietly.
A. Can I write my diary here?
B. May I use your pencil?
C. Anything else?
D. OK. I will.
E. Be quiet, please!