2016年8月上半月,酷暑使蛋鸡处于歇伏期,产蛋率明显下降,且高温下鸡蛋不易保存,市场供应量趋少,下半月随着学校开学和中秋节临近,鸡蛋集中各货需求增加,鸡蛋价格开始土涨。鸡蛋价格变化( )
①是由供不应求导致价格上涨的 ②表明价值的变化决定价格变化
③是多种因素影响供求关系所致 ④会使人们对鸡蛋需求急剧减少
A:①②
B:①③
C:②④
D:③④
如图,四边形ABCD内接于⊙O,AB为⊙O的直径,点C为的中点.若∠A=40°,则∠B=____度.
Hello! I'm Sally. I'm an English girl. Now I'm in Beijing with1parents. Today is Sunday. I2to Yangguang Clothes Store. Wow! I see lots of3clothes in it. They have sweaters at a good4. They have some bags5sports. They have hats in red, black6yellow. The white7are on sale. They8only 15 dollars. I think they are cheap(便宜的), so I9a small one for myself and a large one for my10.
45+x=1415
x =____