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1. When Galileo went home, he began to experiment with the pendulum. P. When he showed it to his teachers, they were delighted. Q. It was not long before physicians were all using the instrument to count the heart beats of their patients. R. Soon he had invented an instrument which marked the rate of pulse-beats. S. Then the clock makers began to use the pendulum to keep time. 6. Today it has many other uses. |
A. | PQRS |
B. | QRPS |
C. | SPQR |
D. | RPQS |
Answer» E. | |