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.

The best title for this passage is

A．American Way of Living
B．Psychological Space
C．Space Needs in Different Countries
D．Psychological Space and Economic Pressure

关于D-二聚体（D-Dimer），描述不正确的是（）

A.胶乳凝集法阴性，ELISA法正常参考值＜400μg／L

B.D-二聚体只来自纤维蛋白降解产物

C.对诊断血栓性疾病和消耗性凝血病等继发性纤溶疾病有较高的特异性

D.原发性纤溶D-=聚体升高

E.D-Dimer对急性肺栓塞有较大的排除诊断价值，若其含量低于500μg／L，可基本排除急性肺栓塞