ECONOMICS
TRADE EXCHANGE AND INTERDEPENDENCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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They ran a race.
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They rang a bell.
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A boy hit a drum.
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They sent up smoke signals.
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Detailed explanation-1: -They were stretcher bearers. They walked around the battlefield looking for the wounded and brought them to medical care.
Detailed explanation-2: -The US Army kept drummers and fifers with the infantry, until they were finally abolished in the field in 1917.
Detailed explanation-3: -The book passes a simple message to us-Goodness gives more goodness. The boy’s giving nature gets him what he wants and despite having things of far more value than a drum, at the end of the day, he just wants his drum. The simplicity in the story is very endearing.
Detailed explanation-4: -Striking the head of the drum changes its shape and compresses the air inside the shell. The compressed air presses on the bottom head and changes its shape. Then, these changes are transmitted to the drum shell and reflected back, and this action is repeated, creating a vibration.