由第二段前两句(见原文)可以推断后一句必然是农业革命也改变了农场的根本面貌——(8)On the farm of today,machines provide almost all the power,(机器已替代了马的角色。)(9)句也可由上文推知下文是写由此而引发出怎样的后果:(9)As a result,the farms of today are able to produce much more food with the same amount of labor。再从However,the agricultural revolution is not over”可推知下句一定是对美国农民(或农场)未来的展望:“In the future,farmers will receive even greater benefits from science and technology.”如此猜测联想之后再听录音,效果当然就大不相同了。