2016年8月以来，某国A商品在中国销售量持续下降。如下图所示，A商品的需求曲线由S₁移动到S₂。下列可能导致这种变动出现的事件有（  ）

①A商品生产商减少生产     ②A商品因售后服务存在问题被媒体曝光

③A商品更新换代，价格上涨 ④A商品的替代品价格下降

补全对话

A:Hello, may I speak to Kate, please?

B:Speaking.

A:Hello, Kate! This is Lily speaking. It's Sunday tomorrow. ____

B:Nothing much. Do you have any ideas?

A:The spring has come. I hear many flowers in park bloom together. It must be very beautiful.____?

B:Good idea. My sister Lucy also likes flowers very much. Let's invite her to come with us.

A:Why not? ____. Sa we can take some wonderful photos.

B:Great. I like taking pictures. ____ ?

A:Let's meet outside the school gate at half past nine in the morning.

B:How shall we go there?

A:Let's go there by bike.

B:Oh, my bike is broken. ____?

A:All right. See you!

B:See you!

分数的分子和分母同时乘一个不等于0的数，分数的大小不变．

It is      of you to work out the maths problem.