—All right.
A:dry
B:wet
C:hurt
D:warm
对于静置沉淀、吸附、过滤、蒸馏等净化水的操作,净化效果最差的是____ ;净化效果最好又可以降低水硬度的操作是____ .
—Where is your father?
—He is __________ a trip to Hangzhou.