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 were ruined. Q: Many different things affect the weather and we have to study them carefully to make accurate forecast. R: Ancient Egyptians had no need of 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:

1. A Option A: PRQS
2. B Option B: QPRS
3. C Option C: QRPS
4. D Option D: SPQR

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