1.

S1: Today the Earth has many satellites besides the moon.P: But the pull of the Earth keep them from doing so.Q: The artificial satellites do not fall because they are going too fast to do so.R: They are artificial satellites made by man and very much smaller than the man.S: As they speed along, they tend to go straight off into space.S6: As a result, they travel in an orbit round the Earth.The Proper sequence should be:

A. RQS
B. PSR
C. QSP
D. PRQ
Answer» D. PRQ


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