单选题
公共英语五级
2010-07-15
2.__________
参考答案
A
答案解析
由上段的最后一句话“took over the hard physical tasks and relieved the strain on human and animal muscles．”可知答案为A，后面选项中的“the labor that required the human eyes，ears，judgment and mind but no sweating”与之呼应，故应选A。