Answer:
Summary.
Explanation:
The given passage talks about how humans have become so dependent on machines. The author considers that one of the defect of our civilzation is that humans have become so dependent on machines. He asserts that humans created machines to aid them and help them. Humans were supposed to be machines master. But, it appears that machines are slowly taking place of humans, as masters.
The author asserts that machines require proper maintenance. They demand proper service and fueling, and on time. If proper caring is not done to them, they begin to throw tantrums by blowing up, bursting out, stopping to work, etc. Humans, according to author, even use their remaining time making more machines, which pose a threat that machines may become humans master.
"Calmly" is the adverb because it describes how he tipped his hat.
The answer is A) mammal
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