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随着人们生活水平的日益提高，汽车走进家庭，它们给我们提供了很多方便，加快了我们工作、生活、学习的节奏，但同时汽车也给我们带来了负面影响，并且由于石油的逐渐减少，造成了能源不足，所幸的是，科技工作者已研究出用乙醇代替汽油作燃料的好办法．

（1）汽车给我们带来了哪些负面的影响？______

（2）用所了解的知识简单分析乙醇代替汽油有哪些优点？______

（3）有人呼吁用步行和骑自行车来代替利用汽车等交通工具有何意义？______．

答案

（1）汽车的增加在给人们带来方便的同时也给人们带来了负面影响，负面影响主要有：造成交通拥挤、噪声污染，空气污染等．

（2）乙醇的燃烧产物是二氧化碳和水，用乙醇代替汽油可以减少污染物的排放．汽油是由石油加工而成的，汽油是不可再生的化石燃料，用乙醇代替汽油可以减少石油的利用，节约化石燃料的利用．

（3）为了节约能源，减轻污染，可以用步行或是骑自行车来代替汽车等交通工具，还可以起到锻炼身体的作用，是一举三得．

故答案为：（1）汽车尾气污染环境

（2）污染轻，节约不可再生资源

（3）节约能源，减轻污染，锻炼身体

单项选择题

5岁2个月女孩，身高84cm，身长的中点位于脐下缘，腕骨骨化中心4个，智力落后，皮肤粗糙，眼睑水肿，眼距增宽，鼻梁宽平，常吐舌。父母非近亲结婚，住地非地方性甲状腺肿流行地区。

确诊需做哪项检查( )

A．血糖测定

B．脑电图检查

C．腕部X线摄片

D．尿三氯化铁试验

E．血T3、T4、TSH检查
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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.

According to the passage, why do people join groups that practice secondary cooperation

A. To share the happiness with others.
B. To get rewards for themselves.
C. To associate with people who have similar backgrounds.
D. To defeat a common enemy.
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