3．What can we learn from the fifth paragraph?

　　A．The washing machine with a metal tub and reduction gears was invented in 1920s.

　　B．The washing machines with a metal tub did not make any noise.

　　C．The cleaning process became simpler thanks to an enameled sheet metal tub.

　　D．The wooden tub washing machine was cheaper than one with a metal tub.

　　答案：C　事实细节题。根据第五段最后一句话可知答案。

　　4．What was an advantage of the spin dry feature?

　　A．It didn't have buttons to control it.

　　B．The wash and rinse temperature could be controlled.

　　C．It avoided accidents involving the hair and hands.

　　D．It speeded up the spin speed.

　　答案：C　事实细节题。根据倒数第二段的“and this replaced the old wringer, which, while drying the clothes, would remove the buttons or cause accidents involving the hair and hands.”已经替代了旧的机器去避免事故的发生。

　　1．revolve vi. 旋转

　　2．dirt n. 肮脏；尘土

　　3．replace vt. 取代；代替

　　4．feature n．/vt. 特色；以……为特色

　　1．wash away 冲刷掉；洗掉

　　2．a variety of 各种各样的；多样的

　　3．help out 帮助……摆脱困难

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