1.

S1: Frozen foods are so popular today that many people wonder how they ever lived without them.P: Near the North Pole, where the ground stays frozen all the year around, there is no problem of preserving foods.Q: Actually, people who live in cool climates have had frozen foods for a long time.R: Ice helped them when they could get it, but they couldn't get it very often.S: But people who live in warm climates have not always been able to keep food fresh.S6: Now refrigerators and deep freezers preserve many foods that could not be kept any other way.The Proper sequence should be:

A. QRS
B. PRS
C. PSR
D. RQP
Answer» D. RQP


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