A：①②
B：②③
C：①④
D：②④
某机场大楼的建设体现了环保理念．
x
2
3
4
5
6
y
2.2
3.8
5.5
6.5
7.0
那么y与x之间的线性回归方程是____．
In fact, Liu Tu's parents have nothing against .
