1.

S1: The heart is pump of life.P : They have even succeeded in heart transplants.Q : Nowadays surgeons are able to stop a patients heart and carry out complicated operations.R : A few years ago it was impossible to operate on a patient whose heart was not working properly.S : If heart stops we die in about five minutes.S6: All this was made possible by the invention of heart-lung machine.The Proper sequence should be:

A. SRQP
B. SPRQ
C. SQPR
D. SRPQ
Answer» B. SPRQ


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