完形填空 (共10分，每小题1分。)
Water is the                of all the things we eat and drink. Not many people understand this but            quite true. The human body can go without            for a long time. We've got many examples for this. Yet two           three days without water can usually make people          . Man can't live            water.
Many people don't understand how          water the human body needs           work well , and many people, especially young people, do not drink enough,        in very hot weather. Our body has mostly water, about 65% to 75%. That is to say about two thirds of our body is water. When we do sports, some of the water will get away from our body.         we don't drink some water, we won't have enough water． And if we don't have enough water, we'll feel tired and many of us will get ill. So you know how important water is to us.

A．important B．most important C．more important D．different

A．it's B．its C．it D．is

A．food B．water C．drink D．meat

A．So B．And C．But D．Or

A．to die B．die C．to died D．died

A．have B．with C．without D．in

A．many B．much C．little D．few

A．and B．the C．/ D．to

A．even B．ever C．almost D．hardly

A．If B．For C．Since D．Because