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阅读理解。 Why should I teach my children history? That sounds like a stupid question to even ask. But, as I hear different home schooling teachers discuss history, I get the idea that there may be different reasons for teaching history. Let me briefly explain the three good reasons for studying history and two bad reasons for studying history. The major reason I see for studying history is that we can learn from the past. I am convinced that the world would be a much better place if more people understood the successes and failures of the past and the things that made these successes and failures. However, as the unfortunately true statement goes 'the one thing we seem to learn from history is that we don't seem to learn from history.' Perhaps at least in teaching history, to my children I can do a small part in changing this. A second major reason for studying history is that it is hard to understand the current political climate in the absence of an understanding of its historical context. We can- not even understand why we are and where we are without history, much less (更不必说) try to figure out where we are going or how we should get where we want to be. I teach my children history, for one more reason. I purchased a set of historical audio (录音机) tapes for our children. My seven-year-old son listened to them over and over. It was my hope that he would become inspired by the accomplishments of people like the Wright brothers to accomplish things by himself. I think that it is good that we celebrate the accomplishments of people like Martin Luther King Jr. if, in doing so, young people are called on to stand for the principles that he stood for and accomplish what he accomplished. I also think that by studying people like Adolph Hitler, people can learn to stand against the things that he stood for. 1. What message can we get from the underlined sentence in Paragraph 2? A. Many people aren't clever enough to learn well from the past. B. Many people fail to make good use of history and make the same mistakes. C. Many people feel it hard to understand history. D. Many people have no interest in studying history. 2. In Paragraph 3, the author shows that history is useful because _______. A. it makes the current political situation go smoothly B. it helps us realize the importance of historical events C. it helps us understand why things are the way they are D. it helps people accept the present situation where they live 3. What would be talked about in the following paragraph? A. How to teach history effectively. B. Some negative reasons for studying history. C. How to get more people to study history. D. Some bad historical figures. 4. The main purpose of this passage is to _______. A. inspire the parents to teach their children history B. show the importance of history in politics C. explain the reasons why children study history D. introduce the writer' s own way of teaching history
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【单选题】单车船静止中倒车,螺旋桨产生的横向力的大小排列顺序为______。
A.
伴流横向力>沉深横向力>排出流横向力
B.
沉深横向力>伴流横向力>排出流横向力
C.
排出流横向力>沉深横向力>伴流横向力
D.
伴流横向力>排出流横向力>沉深横向力
【单选题】[2018单选题]6. 计算机的主频是指 ( )。
A.
硬盘的读写速度
B.
显示器的刷新速度
C.
CPU的时钟频率
D.
内存的读写速度
【单选题】单桨船静止中倒车产生的偏转,主要是由于______的作用。
A.
伴流横向力
B.
沉深横向力和排出流横向力
C.
排出流横向力和伴流横向力
D.
沉深横向力和伴流横向力
【单选题】若空间脉冲长度短则会造成:
A.
较好的横向分辨力
B.
低频
C.
分辨力差
D.
较好的轴向分辨力
【单选题】船速与伴流横向力的关系是______。
A.
船速为零,伴流横向力最大
B.
船速增大,伴流横向力增大
C.
船速为零,伴流横向力最小
D.
船速增大,伴流横向力减小
【单选题】在bootstrap中,下列()不属于按钮尺寸。
A.
.btn-lg
B.
.btn- md
C.
.btn-sm
D.
.btn-xs
【单选题】横向力系数的含义是( )
A.
单位车重上受到的横向力
B.
横向力和竖向力的比值
C.
横向力和垂向力的比值
D.
竖向力和垂向力的比值
【单选题】宪法具有最高的法律效力,法律效力是( )。
A.
法律所具有的约束力和强制力
B.
法律所具有的约束力
C.
法律所具有的强制力
D.
法律所具有的权威性
【单选题】双桨船工作时,除产生单桨船所有的各种效应横向力外,还产生_________。
A.
推力偏心效应横向力转船力矩
B.
分水效应横向力转船力矩
C.
分水效应横向力和推力偏心效应横向力
D.
分水效应横向力转船力矩和推力偏心效应横向力转船力矩
【单选题】[2018]6.计算机的主频是指 ( )。
A.
硬盘的读写速度
B.
显示器的刷新速度
C.
CPU的时钟频率
D.
内存的读写速度
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