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1.
S₁: Most of the perishable foods are shipped by refrigerator ships.
S₆: Ripe bananas are poor travellers and even one ripe banana at the start of the trip can spoil a whole ship load of fruit.

P: They are placed in the refrigerated hold of the ship.
Q: Some foods, such as bananas, are shipped before they get ripe.
R: As the green bananas are loaded, a man watchbs closely the signs of yellow on them.
S: The cool temperatures keep the bananas from getting ripe during the trip.