段1：①The concept of man versus machineis at least as old as the industrial revolution, but this phenomenon tends to be most acutely felt during economic downturns and fragile recoveries. ②And yet, it would be a mistake to think we are right now simply experiencing the painful side of a boom and bust cycle. ③Certain jobs have gone away for good, outmoded by machines. ④Since technology has such an insatiable appetite for eating up human jobs, this phenomenon will continue to restructure our economy in ways we cannot immediately foresee.
31. According to the first paragraph, economic downturns would .
[A] ease the competition of man vs. machine
[B] highlight machines’ threat to human jobs
[C] provoke a painful technological revolution
[D] outmode our current economic structure
答案：B
问：根据原文中的哪几句话可以得出31题的正确答案？（多选题）
A : 段1句①
B : 段1句②
C : 段1句③
D : 段1句④
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