[解析]
(1)C.细节理解题.根据第一段的 In fact,there are some important differences between British English and American English.可知,作者认为虽然美国英语虽然源于英国英语,但仍有一些重要的差异.故选C.
(2)B.词义猜测题.根据第二段的Often,Americans don't say each word separately.They say several words together.通常,美国人不会把每个词分开说,而是把几个词放在一起说.可知,本段的"separately"意思是"一个接一个的",故选B.
(3)D.句意理解题.根据划线句前面的句子 Some American words are never used in England. The 可知,"The same thing is true of some British words in America." 意为"有些英国英语单词在美国英语中没有使用."故选D.
(4)D.细节理解题.根据文章二、三、四、五段可知,文章介绍美式英语和英式英语四种不同:声音,词汇,表达法和语法.故选D.