He helped her and she _____ him with a s

Not everyone in the world requires the same amount of living space. The amount of space a person needs around him is a cultural difference, not an economic one. Knowing your own psychological space needs is important because they ply affect your choices, including, for example, the number of bedrooms in the home. If you were brought up in a two child family and both you and your sister or brother had your own bedrooms, the chances are if you have two children or more, that you also will offer separate bedrooms for them. In America, for example, they train people to want to have their own rooms by giving them their own rooms when they are babies. This is very unusual in the world. In many other countries, the baby sleeps in the same bed with his parents or in bed near them.
The space in the home also shows a lot about psychological space needs. Some families gather closer to each other and the size of their house has nothing to do with it. Others have separate little corners where family members go to be alone.
Although it is true that psychological space needs are not decided by economic reasons, they sometimes have to be changed a little because of economic pressure. It is almost impossible, however, to completely change your psychological space needs.

Some families gather closer to each other at home than others because ______.

A．they have limited living space
B．they are brought up in a large family
C．it satisfies their psychological space needs
D．the children in the family sleep in the same bed with their parents

在单链表中，增加头结点的目的是( )。

A．方便运算的实现

B．使单链表至少有一个结点

C．标识表结点中首结点的位置

D．说明单链表是线性表的链式存储实现

国家发展改革委对项目“资金申请报告”要进行审核，审核后批复，并抄送财政部，获得批准的项目“资金申请报告”的有效期为（）。

A．半年

B．1年

C．2年

D．3年

国发〔2005〕38号文件指出，完善企业职工基本养老保险制度的主要任务其中之一，是统一城镇个体工商户和灵活就业人员（）政策，扩大覆盖范围。

简述对样品、载气、标气管线的配管和管路敷设的要求。