A：①②
B：①③
C：②④
D：③④
My grandmother lives in the west，____ ____ the train station．
周销售量
2
3
4
频数
20
50
30
下列操作中，能降低水的硬度的是（ ）①静置 ②过滤 ③煮沸 ④蒸馏
— Mr. Green gets up very early every morning.
— Yes, so he always goes to work ______ time.
