在以收入法计算国内生产总值时，国内生产总值等于（）。A、固定资产折旧 B、劳动者报酬

已知|x+3|+（y+2）²=0，求xy=﹙    ﹚．

有下列光学器具：照相机、潜望镜、幻灯机、穿衣镜、放大镜、牙医内窥镜。可以把它们分成两类：

一类包括____________，其特征为____________；

二类包括____________，其特征为____________。

具有严格季节性的疾病是（）。

A.呼吸道传染病

B.肠道传染病

C.虫媒传染病

D.一些慢性病

E.以上均否

宝黛吵架后，宝玉“又自己后悔：„方才不该和他较证，这会子他这样光景，我又替不了他。‟”这里所运用的人物描写方法是（）

A.语言描写

B.心理描写

C.行为描写

D.细节描写

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.

The word "fragile" in the last paragraph is closest in meaning to________.

A．inefficient

B．easily broken

C．poorly planned

D．involuntary