Today, we take washing machines for granted, but there was none before 1869. The revolving drum（旋转桶）of that first machine set a pattern for the future, but it was crude by today’s standards. The drum was turned by hand, and needed a lot of effort. Eight years passed before someone produced an electric washing machine. The world had to wait even longer for a machine to dry clothes. The first spin-drier was another American invention, patented in 1924; but it was 20 years before such machines were widely used.

　　It was yet another American, called Bissell, who introduced the carpet sweeper. He patented the original machine back in 1876. It didn’t pick up dirt very well, but it was quicker than a dustpan and brush. Thirty-six years later, even the carpet sweeper was old-fashioned: modern homes now have a vacuum cleaner（吸尘器）with an electric motor to suck the dust. 60. Whose sewing machine could do far more than the work that was done by five skilled sewing women?

　　A. Thomas Saint’s.

　　B. Bartelemy Thimonier’s.

　　C. Elias Howe’s.

　　D. Isaac Singer’s.

　　61. According to the article, modern inventors __________ .

　　A. follow the pattern of the first revolving drum but improve it much

　　B. only imitate the first washing machine

　　C. power the first ever-made washing machine by electricity

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