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问题 选择题

小芳经常牙龈出血，医生建议她多吃新鲜蔬菜和水果，这是为了补充（　　）

A．维生素A

B．维生素B１

C．维生素C

D．维生素D

答案

答案：C

维生素既不参与构成人体细胞，也不为人体提供能量，而且人体对它的需要量很小，但它对人体的各项生命活动有重要的作用；人体一旦缺乏维生素，就会影响正常的生长和发育，还会引起疾病．

解：人体一旦缺乏维生素，就会影响正常的生长和发育，还会引起疾病，如图：

小芳经常发现牙龈出血，这是坏血病的表现，是体内缺乏维生素C造成的，新鲜蔬菜和水果中富含维生素C，因此医生建议他多吃些新鲜蔬菜和水果．

故选：C

维生素的作用以及缺乏症是考试的重点，要注意掌握，可结合上面表格中的内容来比较记忆．

问答题 简答题

特种作业对上岗人员有何要求？
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单项选择题

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.
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