看图短文填空。__________ all the things we eat and drink, water is the most important. Not many people realize this, but it is quite true. The human body can live
___________ food for a long time, but two or three days without water usually leads to(导致)death. Many people do not understand how
__________ water the human body needs at work and many people do not drink
_________ especially in cold weather. Most people drink enough only in
___________ weather. Most people drink when they are
___________, but we often need more water, especially
__________ doing exercise.
A man’s body contains 65%-75% water. Water is very important in several different __________. Most people need about five to seven liters(升)of water every day, but we do not need to drink that amount(量),
____________ a lot of water comes from the food we eat. If we do not have enough water, however, we
____________ tired and may become ill.