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问题 单项选择题

脑膜瘤多发于

A．男性
B．儿童
C．男性稍多于女性
D．女性稍多于男性
E．男女相等

答案

参考答案：D

解析：[解题思路] 脑膜瘤发病率有明显的性别差异，一般男女发病率之比约为1:2，目前认为造成女性发病率较高的原因与雌激素有关。

单项选择题

The first and most important agents of socialization are the people who care for infants. In the earliest months, messages from nurturers constitute the child’s basic understanding of the world around it. This is the infant’s first introduction to the language that shapes perception and elicits emotion.
Another powerful source of information and socialization is the friendship of peers. Peers are equals that one can deal with on the same level as oneself, whereas parents are superiors. The heavy emotional overlay of family relationships makes some kinds of learning difficult.
Much formal socialization is placed in the hands of professionals. Teachers from kindergarten on are specifically designated agents of socialization. Ideally, a teacher is one who has both knowledge and the skills to present it. During the course of teaching their subjects, classroom instructors provide role models and attempt to convey the excitement of learning itself.
In earlier times, parents, friends and teachers would comprise the list of primary childhood socializers. Children’s books, comics and magazines might also have been mentioned as sources of information on norms and role models. Today one must add three powerful indirect or non-personal socialization agents: radio, movies and television. Many people learn about politics, form a vision of well-being, and develop attitudes towards others from what they see on the screen and hear through the speakers.

The author’s chief agents include the following EXCEPT the ______.

A．family

B．group

C．school

D．internet
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问答题

矿泉水一般是由岩石风化后被地下水溶解其中可溶部分生成的．此处所指的风化作用是指矿物与水和CO2同时作用的过程．例如钾长石（KAlSi3O8）风化生成高岭土[Al2Si2O5（OH）4]，此反应的离子方程式为：2KAlSi3O8+2CO2+7H2O═2K++2HCO3-+4H2SiO3+Al2Si2O5（OH）4，这个反应能够发生的原因是什么？
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