參考答案：
　　1.選B.本題為主要細(xì)節(jié)正誤題。第三段第一句說“The first practical typewriter was patented in the United States in 1868 by Christopher Latham Sholes.”，由此可知，B選項(xiàng)正確。
　　2.選D.本題為觀點(diǎn)態(tài)度推斷題。第二段最后一句“That machine probably didn't sell because no one could remember its name!”可推知，坐著認(rèn)為機(jī)器可能賣不出去是因?yàn)樗拿痔L了，沒有人能記住。
　　3.選C.本題為觀點(diǎn)態(tài)度推斷題。從第四段“……h(huán)is "ABC" key arrangement caused the keys to jam when the typist worked quickly. ”可知，肖爾斯決定“QWERTY”這種排列是為了解決“ABC”鍵這種排列所引起的“鍵堵塞”問題。
　　4.選C.本題為主要細(xì)節(jié)正誤題。從第四段中的“……h(huán)is solution was to keep the typist from typing too fast.”和“The only efficiency it added was to slow the typist down……”可知，QWERTY排列只能讓打字員的打字速度慢下來，C選項(xiàng)與其意思一致。
　　5.選A.本題為主旨?xì)w納題。第一段的“Who decided on this arrangement of the letters? And why?”是全文的主旨句，文章后面的內(nèi)容都是圍繞這兩個(gè)問題展開的。