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Before there were alarm clocks, how did people wake up at a specific time they wanted to in the morning? Since the Industrial Revolution began in the 1780s, people had been finding ways to make sure they got to work on time. Back then, a knocker-up, also known as a “knocker-upper,” started as a profession to wake people up by knocking on their doors or windows. ... (Reading passage continues about knocker-ups) ... By the 1950s, knocking up had gradually died out in most places due to the wide spread of electricity and affordable alarm clocks. Today, people merely read about anecdotes regarding how knocker-ups woke up their clients creatively or a fun tongue-twister like the one above.
What is the main idea of the third paragraph?
ATo make noise on windows, knocker-ups often relied on long, light bamboo sticks.
BTo accomplish their tasks, knocker-ups would not leave until their clients woke up.
CTo wake up their clients, knocker-ups used a tool from which they could shoot dried peas.
DTo ensure a successful job, knocker-ups had adopted several creative knocking-up methods.正確答案
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