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1.
S₁: Frozen foods are so popular today that many people wonder how they ever lived without them.
S₆: Now refrigerators and deep freezers preserve many foods that could not be kept any other way.

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 fi-esh.