48. The text is mainly about

　　.

　　A. telling the story through picture

　　B. decorating the walls of homes

　　C. publishing historical papers

　　D. expressing feeling through pictures

　　D. Their teaching was an enjoyable experience.

　　C

　　Find Which Direction Is South

　　Do you have a good sense of direction? If not, please take with you a compass. But if you forget to take a compass, you can still find your way.

　　It’s never a good idea to imagine that the family member who was entrusted（委托）with the job of map-reading actually knows where the family is. You can tell by the slightly confused load on their faces that nothing on the ground seems to match the map. Never mind. The shu is shining and it’s still morning. If you don’t know the exact time, you can still find out where south is, but you’ll need to be patient.

　　①Find a straight sick and put it in the ground in a place where you can mark its shadow.

　　②Try to position the stick as vertically（垂直）as you can. You can check this by making a simple plumb line （铅锤线）with a piece of string and weight. You haven’t got any string? OK, use a thread from your clothes with a button tied at the end to act as a weight.

　　③Mark the end of the shadow cast by the stick.

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