水文学常用的研究方法之一为( )。A．逆推渐近法 B．演绎三段法 C．成因分析法

阅读理解。

     The Internet has become part of teenage life. A new report on 3,375 students aged from 10 to 18 in

seven Chinese cities found that 38 percent of them believe they use the Internet often.

     While most of them get useful information and use the Internet to help in their studies, some are not

using it in a good way. Many are playing online games too much.. A few even visit websites they shouldn't

look at. Hong Ying, a teacher from Beijing Yinghua Middle School warns that bad things can happen if young

people spend too much time on the Internet. She had a student who used to be good at school. But then he

started visiting sex websites. He went mad, cheated a girl and was taken away by the police.

     In order to help young people use the Internet in a good way, a textbook on good Internet behavior has

started to be used in some Shanghai middle schools this term.

     The book uses real examples to teach students all about good ways of using the Internet. The book gives

useful advice such as it's good to read news or to find helpful information to study. Teachers and parents all

think the book is a very good idea.

     Hong said the book will be a guide for teens using the Internet. She believes it will keep students away

from bad websites.

判断正误。

( ) 1. About 1282 among the 3375 students believe they use the Internet very often.

( ) 2. Not all children are using the computer in a good way. 

3. 将文中划线句子翻译成汉语。

    ______________________________________________________________________

4. What's the textbook about? 

    ______________________________________________________________________

5. What's the aim of the book? 

    ______________________________________________________________________

企业组织的系统性表现在______

A．企业组织系统中的各个要素相互依存

B．企业组织系统与外部环境相互依存

C．企业组织系统与其他企业组织系统相互联系

D．企业组织系统与其他机构相互依存

E．企业组织系统与政府主管部门相互依存

器质性精神障碍最为常见综合征是（）

A.对自身健康过分关注，相信患了某些实际并不存在的疾病，并对微不足道的症状和体征过分夸张，终日焦虑紧张

B.以识记能力障碍，近事遗忘为主；并错构或虚构以及顺行性或逆行遗忘，时间和地点定向障碍为核心的临床综合征

C.以紧张性木僵和紧张性兴奋两种状态交替出现，突出表现为全身肌张力增高为主的临床综合征

D.包括躁狂状态（主要表现为情感高涨、思维奔逸和活动增多等）和（或）抑郁状态（表现为情绪低落、思维迟缓和活动减少等）

E.以强迫观念、强迫情绪或强迫动作等分别或某种结合形式临床综合征

水是一切生物生存所必需的，我们应该了解有关水的一些知识。

（1）洪泽湖是我国著名的淡水湖。某同学对洪泽湖的水样进行了相关的研究。洪泽湖水属于__________（填“纯净物”或“混合物”），为了检验湖水是软水还是硬水，可向水样中加入___________，搅拌。在日常生活中，常采用________的方法降低水的硬度。

（2）我国是淡水资源非常有限的国家，爱护水资源是每个公民的责任和义务。下列行为属于浪费水的是      （填字母编号）；

A．洗手擦香皂时不关上水龙头

B．用洗菜水浇花

C．用洗衣水冲厕所

D．用自来水不断为西瓜冲水降温（3）学习化学以后，我们对水有了一些新的认识。

①知道了水的微观结构。构成水的粒子可表示为          （填序号）。

②了解了水的宏观组成。水中氢元素、氧元素的质量比是           。

③认识了水的化学性质。写出下列化学反应方程式：

水中通直流电                      水中通入二氧化碳                    

企业系统规划方法(BSP)研究最为基础的环节应是定义企业过程和 【2】 。