Cooperation is the common endeavor of two or more people to perform a task or reach a jointly cherished goal. Like competition and conflict, there are different forms of cooperation, based on group organization and attitudes.
In the first form, known as primary cooperation, group and individual unite. The group contains nearly all of each individual’s life. The rewards of the group’s work are shared with each member. There is an interlocking identity of individual, group, and task performed. Means and goals become one, for cooperation itself is valued.
While primary cooperation is most often characteristic of preliterate societies, secondary cooperation is characteristic of many modern societies. In secondary cooperation, individuals devote only part of their lives to the group. Cooperation itself is not a value. Most members of the group feel loyalty, but the welfare of the group is not the first consideration. Members perform tasks so that they can separately enjoy the fruits of their cooperation in the form of salary, prestige, or power. Business offices and professional athletic teams are examples of secondary cooperation.
In the third type, called tertiary cooperation or accommodation, latent conflict underlies the shared work. The attitudes of the cooperating parties are purely opportunistic; the organization is loose and fragile. Accommodation involves common means to achieve antagonistic goals; it breaks down when the common means cease to aid each party in reaching its goals. This is not, strictly speaking, cooperation at all, and hence the somewhat contradictory term antagonistic cooperation is sometimes used for this relationship.

As used throughout the passage, the term "common" is closest in meaning to which of the following

A．ordinary.

B．shared.

C．simple.

D．popular.

男性患者，35岁，半年来逐渐贫血，不发热，无出血症状，尿呈浓茶色，巩膜可见轻度黄染，肝脾不肿大，Hb82g／L，WBC5．6×10⁹／L，PLT93×10⁹／L，网织红细胞5％。为确诊首选哪项检查：（）

A.骨髓穿刺

B.血清铁定量

C.尿含铁血黄素

D.抗入球蛋白试验

E.酸化血清溶血试验