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问题 选择题

下图反映的是下列哪个地区的气候特点

A．华北平原

B．西西伯利亚平原

C．阿根廷潘帕斯草原

D．西欧平原

答案

答案：A

本题考查世界气候类型分布。按照图中所示，一月气温低于0°C为温带气候类型，降水一月少七月多则为温带季风气候，我国北方的华北平原符合。B．西西伯利亚平原为温带大陆性气候， C．阿根廷潘帕斯草原为热带草原气候，D．西欧平原为温带海洋性气候。

单项选择题

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.

In Paragraph 5, "two-tier system" means some ______.

A．men have many wives while others have none

B．people are very rich while others are very poor

C．people have too much work to do while others have nothing to do

D．people control others
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单项选择题

根据表中给出的逻辑关系绘制的双代号网络图如下所示：

工作名称ABCDEF
紧前工作--A、BA、BBC、D、E

在网络计划的检查过程中，发现某工作的实际进度延后了3天，而该工作的总时差和自由时差分别为7天和4天，则此工作的进度拖延（）。

A．不影响总工期，但将其后续工作的最早开始时间推迟3天

B．既不影响总工期，也不影响其后续工作的正常进行

C．将使总工期延长3天，但不影响其后续工作的正常进行

D．将使总工期及其后续工作的最早开始时间均推迟3天
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