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S1: Forecasting the weather has always been a difficult business.P: During a period of drought, streams and rivers dried up, the cattle died from thirst and the crops were ruined.Q: Many different things affect the weather and we have to study them carefully to make an accurate forecast.R: Ancient Egyptians had no need of this weather in the Nile valley hardly ever changes.S: In early times, when there were no instruments, such as thermometer or the barometer, man looked for tell-tale signs in the sky.S6: He made his forecasts by watching flights of the birds or the way smoke rose from fire.The Proper sequence should be:

A. RQS
B. PRS
C. RPS
D. PQR
Answer» C. RPS


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