若每人组装同一种型号玩具的速度都相同，根据以上信息，解答下列问题：

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!

青藏地区之所以能成为一个独特的地区，是因为（    ）