答案：

　　Part Ⅳ Reading Comprehension (Reading in Depth)

　　Section A

　　47. divorced from reality/unrealistic

　　48. The backbreaking labor of the working poor. /The bowed backs of the working poor.

　　49. (their) lack of skill/(their)low skill

　　50. much greater

　　51. Poor.

　　試題解析：

　　Part Ⅳ Reading Comprehension(Reading in Depth)

　　Section A

　　47.文章一開始作者講到美國人一直相信這樣一個(gè)神話：只要工作就有回報(bào)，工作的人完全可以養(yǎng)家.但緊接著作者說“It's a myth that has become so divorced from reality that it might as well begin with the words‘Once upon a time.”(這個(gè)神話和現(xiàn)實(shí)有如此大的差距以至于我們?cè)谶@么說之前得加上“很久很久以前……”。)所以本題可以填寫原文中的原詞“divorced from reality”.這樣要填寫的句子的意思就符合原文了，作者說“我們最好在前面加上很久很久以前”，暗示美國神話已經(jīng)脫離了現(xiàn)實(shí)。基于對(duì)這部分意思的理解，也可以填寫“unrealistic”，表示這一神話般的說法是不現(xiàn)實(shí)的。

　　48.第一段最后一句“The American Dream for the well-to-do grows from the bowed backs of the working poor，who too often have to choose between groceries and rent.”中的grows from和問題中的is built upon是一個(gè)意思。因此，本題可以用“The bowed backs of the working poor，”來回答，也可以基于理解，回答成“The backbreaking labor of the working labor”。

　　49.第三段第一句“We ease our consciences，Shulman writes，by describing these people as ‘low skilled，’ as though they're not important or intelligent enough to deserve more.”中的“ease our consciences”就是“減輕負(fù)疚感”的意思。因此只要回答歸咎于勞動(dòng)者“技能低下”就可以了。原文用的是形容詞“l(fā)ow skilled”，題目中在介詞to后用名詞。因此答案可以是“(their)lack of skill”或者“(their) low skill”。

　　50.第三段倒數(shù)第二句，“While the bottom 10 percent of American workers earn just 37 percent of our average wage，their，counterparts in other industrialized countries earn upwards of 60 percent.”中提到美國工資最低的10%的勞動(dòng)者的收入占美國人均收入的37%，而在其他工業(yè)國家，這類勞動(dòng)者的收入達(dá)到這些國家平均收入的60%。由此可見，美國勞動(dòng)者的最低收入和人均收入的差距要比其他工業(yè)國家的大很多。因此，正確答案為“much greater”。

　　51.文章最后一段說“Almost 40 years ago，when Lyndon Johnson declared war on poverty，a family with a car and a house in the suburbs felt prosperous.Today that same family may well feel poor...”?？梢娬_答案是“Poor”。