69．From the passage we can see that the Graihead Caverns presently serve as

　　.

　　A．an underground lad B．an Indian meeting place

　　C．a place of interest

　　D．a national museum

　　70．Which of the following is true according to the passage?

　　A．The Lost Sea came into being not long ago.

　　B．The Lost Sea was believed to be somewhere long, long ago.

　　C．The cave which was found was full of water.

　　D．The depth of the water has been found out now.

　　C

　　Of all the things we eat and drink, water is the most important. Not many people really know this but it is quite true. The human（人）body can go without food for a long time, but two or three days without water usually result（v.）in death.

　　Many people do not understand how much water the human body needs to work well and many people do not drink enough, especially（尤其）in hot weather. Most people drink when they are thirsty but often need more water, especially if we have been taking exercises.

　　A man’s body is 65 to 75 percent（百分之）water. Most people need about five to seven litres （公升）of water every day, though we do not need to drink that much because a lot comes from the food we eat. If we do not have enough water we feel thirsty and may become ill. Do you know what the best drink is? Yes, cold water.

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