A．The removal of water in food helps prevent it from going rotten.
B．The open-air method of drying food has been known for hundreds of years.
C．In the course of dehydration, the temperature of hot current coming from entry to exit is gradually going up.
D．The process of drying liquids is much more complex than that of drying solid food.

A．The roof of the woman’’s house needs to be repaired.
B．The roof of the man’’s house has several bad leaks.
C．The woman’’s bathroom was badly damaged.
D．The man works for a roofing company.