[填空题]Periodically in history, there come periods of great transition in which work changes its meaning. There was a time, perhaps 10,000 years ago, when human beings stopped feeding themselves by hunting game and gathering plants, and increasingly turned to agriculture. In a way, that represented the invention of "work".
Then, in the latter decades of the 18th century, as the Industrial Revolution began in Great Britain, there was another transition in which the symbols of work were no longer the hoe and the plow; they were replaced by the mill and the assembly line.
66. ______
With the Industrial Revolution, machinery—powered first by steam, then by electricity and internal combustion engines—took over the hard physical tasks and relieved the strain on human and animal muscles.
67. ______
And yet, such jobs have been characteristic of the human condition in the first three-quarters of the 20th century. They’ve made too little demand on the human mind and

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