参考答案：
　　1.选B.本题为主要细节正误题。第三段第一句说“The first practical typewriter was patented in the United States in 1868 by Christopher Latham Sholes.”，由此可知，B选项正确。
　　2.选D.本题为观点态度推断题。第二段最后一句“That machine probably didn't sell because no one could remember its name!”可推知，坐着认为机器可能卖不出去是因为它的名字太长了，没有人能记住。
　　3.选C.本题为观点态度推断题。从第四段“……his "ABC" key arrangement caused the keys to jam when the typist worked quickly. ”可知，肖尔斯决定“QWERTY”这种排列是为了解决“ABC”键这种排列所引起的“键堵塞”问题。
　　4.选C.本题为主要细节正误题。从第四段中的“……his 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排列只能让打字员的打字速度慢下来，C选项与其意思一致。
　　5.选A.本题为主旨归纳题。第一段的“Who decided on this arrangement of the letters? And why?”是全文的主旨句，文章后面的内容都是围绕这两个问题展开的。