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    What does it mean when parents fight? 　　

    It's hard for most people to hear their parents shouting at each other. You might worry more about one parent

or the other during an argument. Or maybe you worry that one parent could become angry enough to lose

control. It's understandable to feel this way when there's fighting around you. 　　

    If your parents are arguing about you, you might mistakenly think the argument is your fault (错误). But your

parents' arguments are never your fault. 　　

    If your parents' fighting really troubles you, you might find it hard to sleep or go to school. If things are going

like this, try talking to one or both of your parents about what they are doing. They may not even realize how

bad you feel until you tell them how their arguments affect (影响) you. 　　

    If the fighting goes too far, let someone else know what's going on. Talking to other relatives or a teacher

about the fighting can be helpful. Sometimes parents who fight can go so far that they hurt each other or other

family members. If this happens, letting someone else know will allow the family to be helped and protected

from such harmful fighting. 　　

    Family members can learn to listen to each other and talk about feelings and differences without shouting at

each other. They can get help from others with the problem of fighting. Though it may take some work, time,

and practice, people in families can always learn to get along better. 　　

    If your family argues from time to time, try not to worry too much: No family is perfect. Even in the happiest

home, problems come up and people argue. Usually the family members get what's troubling them out in the

open and talk about it. Hopefully, they can reach some agreement. Everyone feels better and life is OK again. 　　

    Being part of a family means everyone tries to make life better for each other. Arguments happen and that's

OK. But with love, understanding, and some work, families can solve almost any problem.

1. When parents are arguing about us, we'd better _______. [ ]

A. worry about our mother 　　

B. not become angry enough to lose control 　　

C. try to find out our mistakes 　　

D. understand that it's not our fault

2. If your parents fight, you _______. [ ]

A. shout at them 　　　

B. go to school 　　　

C. talk to them 　　　

D. go to sleep

3. Which is not true according to the passage? [ ]

A. People argue even in the happiest families. 　　

B. It's OK for parents to argue from time to time. 　　

C. People reach some agreement after fighting. 　　

D. Love and understanding can prevent parents' fighting.

50kg水在1个标准大气压下，由20℃加热到120℃，共需（）kcal热量。（已知水在20℃时的焓值为20kcal/kg，120℃时的焓值为647kcal/kg）

A、3135000

B、627

C、32350

D、31350

关于颅脑火器伤的伤道特点说法不准确的是（）

A.分为原发伤道区、脑挫伤区和震荡区

B.原发性伤道区为投射物直接造成的伤道

C.脑挫伤区位于原发伤道周围，病理表现为血管断裂形成出血

D.震荡区可大小不一

E.在伤道各个位置均存在明显的震荡区，为火器伤的特点

单相半波可控整流电路带大电感负载并接有续流二极管，整流变压器副边的电压有效值为90V，在α＝180°时输出电压平均值为（）V。

A.0

B.45

C.60

D.90

材料一：战国之际，齐、赵、魏等以自利，纷作堤防。大水时至淹没，则更筑堤防以自救，以致壅塞日甚。……列国兵争，引水决灌又为一端。……直到东汉明帝时的王景手里而河患遂绝。迄宋代，并不见危害中国……

宋代河患，亦有其前兆，唐河朔地，天宝后久属藩臣，纵有河事，不闻朝廷。而五代兵争，决水行军之事又屡次见到。两百七十余年的横征暴敛，穷兵黩武，农业状态日益变坏，水道沟洫自然只有破毁而没有兴修。……又兼明清两代政治之腐败，河工之浪费与黑暗，更益造成黄河危害中国之局面。及至认为黄河十年一渍决，百年一改道，是理当的事；黄水之来，只有共工、伯鲧的高筑堤防，是惟一的办法。

——钱穆《水利与水害（上篇：论北方黄河）》

《资治通鉴》开篇言道：“初（周威烈王二十三年，公元前403年）命晋大夫魏斯、赵籍、韩建为诸侯。”司马光把此事件划定为一个全新时代的点。

材料二：黄河入海口海岸变迁示意图

材料三：山东是我国的人口大省和农业大省。近年来，山东省利用海岸线长、港口多的优势，大力发展海洋渔业、滨海旅游和海洋油气产业，进出口总值、实际利用外资额快速攀升；在传统农业的基础上，通过龙头企业带基地，联农户，开展优势农产品标准化生产，农产品质量效益不断提高；海尔、海信等一批龙头骨干企业通过技术创新和技术改造，凭借多年形成的品牌优势，在经济危机的困境中逆势发展在为一大亮点。2009年山东省GDP33805．3亿元，居全国第三。

材料四：2009年，国务院先后批准了“黄河三角洲高效生态经济区”等11个区域发展规划，这些由地方政府主导而上升为国家战略层面的区域发展规划，既遵循国家区域发展总体战略的要求，立足经济社会发展大局的需要，又充分发挥各个地方的比较优势，效果非常明显。

阅读材料一图片，分别说明图片的各历史时期发生在黄河流域的重大变化对中国历史发展进程的影响。