单选题
At the beginning of the twentieth century, North American society held, as an ideal，the Nuclear Family. This presumably perfect residential, social, and economic unit consisted of an adult male, an adult female and their minor children. This structure was thought to be stable and long lasting.
However, a few decades later, the structure of that ideal family was being altered radically even while it was being touted as the structure to be aimed for. Popular magazines bemoaned the loss of the Nuclear Family and its replacement with inferior forms.
There are a number of factors that are acting in concert to apply pressure on the Nuclear Family and generate a variety of new structures. Some of these are:
The definition of marriage has changed somewhat in that few people now consider it to last "until death do us part". The concept of monogamy (the marriage of one man and one woman) has been modified to a form now referred to as serial monogamy (the marriage of one man and one woman at a time). This reflects the increasing equality of women and men in terms of economic advantage and the recognition that many women no longer depend on men for their survival. Women are acquiring independence and have become empowered to make their own choices. With this independence, the need to form a relationship with a man becomes less important. This change embodies the concept that the marriage is temporary and can be terminated by either partner at any time. Associated with this, of course, is the relaxation of the divorce laws and the significant reduction of the shame that had one time been attached to divorce
The economy of North America has resulted in a two-tier system of a few rich who control most of the resources and a large portion of the population who control almost none of the resources. Because of this, many couples are forced to have both partners with full-time jobs outside the home. There are unintended byproducts of the need for a double income. The most important of these is the replacement of a mother-oriented socialization of children to a "stranger-oriented" socialization system reflected in the growth of the childcare industry. Also, either partner is financially able to end the marriage without significant hardship.
The combination of these changes will in the coming decades have a profound effect on the structure of the family of North America. As a result, the family will be a fluid, constantly changing structure with variable household arrangements as the norm.
单选题
In the 1910s most North Americans believed that the Nuclear Family ______.
【正确答案】
B
【答案解析】[解析] 本题考查事实细节。根据文章第一段第一句“At the beginning of the twentieth century, North American society held, as an ideal, the Nuclear Family.”可知，B项为正确答案。根据第一段最后一句“This structure was thought to be stable and long lasting.”可知，A项不正确；C、D两项在文中并未提及。
单选题
What happened to the Nuclear Family in the middle Of the twentieth century?
【正确答案】
A
【答案解析】[解析] 本题考查事实细节。根据文章第二段第一句“However, a few decades later, the structure of that ideal family was being altered radically.”可知，几十年后，理想家庭结构有了根本性改变。所以，答案是A。
单选题
In the middle of the twentieth century, people in North America ______.
【正确答案】
C
【答案解析】[解析] 本题考查事实细节。根据文章第二段第一句“However, a few decades later, the structure of that ideal family was being altered radically even while it was being touted as the structure to be aimed for.”可知，人们吹捧核心家庭是他们的目标家庭结构。据此推断，答案是C。
单选题
What has changed the Nuclear Family in North America?
单选题
What is the major factor that has raised the divorce rate in North America?
【正确答案】
A
【答案解析】[解析] 本题考查事实细节。根据文章第四段第三句“This reflects the increasing equality of women and men in terms of economic advantage and the recognition that many women no longer depend on men for their survival.”可知，正确答案是A。
单选题
In Paragraph 4, "until death do as part" probably means remaining married ______.
【正确答案】
B
【答案解析】[解析] 本题考查短语意义。根据文章第四段第二句中的monogamy和serial monogamy可知，"until death do us part".的意思是至死都和某个人保持婚姻关系，所以，答案是B。
单选题
In Paragraph 5, "two-tier system" means some ______.
【正确答案】
B
【答案解析】[解析] 本题考查事实细节。根据文章第五段的第一句话“The economy of North America has resulted in a two-tier system of a few rich who control most of the resources and a large portion of the population who control almost none of the resources.”可知，正确答案是B。
单选题
Many wives work outside their home because they ______.
【正确答案】
D
【答案解析】[解析] 本题考查事实细节。根据文章第五段前两句“The economy of North America has resulted in a two-tier system of a few rich who control most of the resources and a large portion of the population who control almost none of the resources. Because of this, many couples are forced to have both partners with full-time jobs outside the home.”可知，因为产生了双重体系，所以，很多夫妇被迫双双出去工作。据此推断，答案是D。
单选题
""Stranger-oriented" socialization system" in Paragraph 5 probably means ______.
【正确答案】
A
【答案解析】[解析] 本题考查事实细节。根据文章第五段第四句“The most important of these is the replacement of a mother-oriented socialization of children to a "stranger-oriented" socialization system reflected in the growth of the childcare industry.”可知，妈妈无暇照顾孩子，而是由陌生人来家中照顾孩子。所以，答案是A。