假设关于某设备使用年限x(年)和所支出的维修费用y(万元)有如下统计资料：

若由资料可知y对x呈线性相关关系，则y与x的线性回归方程=bx+a必过的点是

一个圆形花坛，直径是8米，在它的周围铺一条宽1米的小路，这条小路的面积是多少?

肺泡壁是由（　　）

下列各图中，∠1与∠2互为余角的是（   ）

选择下列词汇完成下面对话。并在答题卡上将相应的字母编号涂黑．

A. take   B. where   C. present   D. enjoyed   E. pleasure   F. broke down

A: Hello, Jim!
B: Hello, Wei Hua!
A: Thanks for inviting me to your birthday party yesterday evening. I ____ it very much.
B: Thank you for your nice present!
A: It was my ____ !
B: By the way, ____ are you going?
A: I’m going to see Uncle Wang. My radio ____  last week. I took it to him to repair yesterday. I'm going to get it back.
B: May I go with you?
A: Why not? His home is not far away from here. It'll____  us about ten minutes.
B: OK! Let's go.