磁感应强度的方向 A.平行于电流和导体所受力所在的平面 B.与产生磁场的电流大小无关 C.与介质的磁导率无关 D.垂直于电流和导体所受力所在的平面 E.null F.null G.null H.null - 查题网

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河南成教 / 电磁场与电磁波

正确率：100%

磁感应强度的方向

A.平行于电流和导体所受力所在的平面

B.与产生磁场的电流大小无关

C.与介质的磁导率无关

D.垂直于电流和导体所受力所在的平面

E.null

F.null

G.null

H.null

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电磁场与电磁波

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5[阅读题] Passage 1 As little children, most of us were taught the virtue (美德) of honesty from fairy tales and other stories. The story of Pinocchio, who begins life as a puppet (木偶), teaches us the importance of telling the truth. In the story of young George Washington, who lies about cutting down the cherry tree, we learn that he earns his father’s praise only when he admits what he has done. Even though we know that “honesty is the best policy,” why do we often lie in our everyday life? The fact is that we lie for many reasons. We sometimes lie to minimize (将……最小化) our errors and mistakes. For example, some students might lie to their teachers about unfinished homework. They might say that they left the work at home when, in fact, they didn’t even do the work. These students don’t want to be irresponsible (无责任感的), so they make up a lie to save face. Another reason we lie is to get out of situations we don’t want to be in. If we just don’t want to attend the dorm meeting early on Saturday morning, we might give the excuse: “I’ve been fighting off a cold all week, and I need to sleep on Saturday morning.” We lie because we believe that telling the truth will cause problems. When we don’t know how to say no, we often use lies to avoid difficulties. However, lies are not always negative (消极的); in fact two kinds of lies can yield positive (积极的) results. The first is commonly referred to as a “white lie.” We tell white lies when we don’t want to hurt other people’s feelings. For example, if a good friend shows up with an unflattering (难看的) haircut, we could be truthful and say, “That haircut is awful. It doesn’t suit you at all!” Instead, we are more likely to lie and say, “I like your haircut. It looks good on you,” and spare our friend’s feelings. The second kind of positive lie is the “protective lie.” This one can help us get out of or avoid dangerous situations. Parents often teach their children to use this kind of lie. For example, parents tell their children not to say that they are home alone if they receive phone calls from strangers. In this situation, lying can prevent harm or disaster. People lie for many reasons, both good and bad. However, before we resort to (采用) lying to cover up mistakes or to avoid unpleasant situations, perhaps we should rethink our motives (动机) for lying. 1. What is mainly discussed in this passage? A. The importance of telling the truth. B. Positive and negative results produced by lies. C. The reasons or motives for telling lies. D. How to stop telling lies. 2. Which of the following is a “white lie” according to the passage? A. A lie told by a student to his teacher about unfinished homework. B. A lie told by someone who wants to avoid hurting others. C. A lie told by child to avoid an unfavorable situation. D. A lie told by a boy who cried wolf. 3. Why do some students lie to their teachers about their unfinished homework? A. Because they want to minimize their mistakes. B. Because they have no idea about the virtue of honesty. C. Because they have left their homework at home. D. Because they don’t have a sense of responsibility. 4. Which of the following can be regarded as an “unflattering haircut”? A. A haircut that is pleasant to the eye. B. A haircut that suits somebody well. C. A haircut that does not look good on someone. D. A haircut that is fashionable and popular. 5. Which of the following statements is NOT true according to the passage? A. People tell lies in order to maintain their relationship. B. Telling the truth may cause problems on some occasions. C. “Protective lies” can help us get out of dangerous situations. D. Lies do not always produce negative results. CBACA Passage 2 Psychological research has focused on a number of basic principles that help memory: meaningfulness, organization, association, and visualization. It is useful to know how there principles work. Meaningfulness affects memory at all levels. Information that does not make any sense to you is difficult to remember. There are several ways in which we can make material more meaningful. Many people, for instance, learn a rhyme to help them remember. Do you know the rhyme "Thirty days has September, April, June, and November..."? It helps many people remember which months of the year have 30 days. Organization also makes a difference in our ability to remember. How useful would a library be if the books were kept in random order? Material that is organized is better remembered than jumbled information. One example of organization is chunking. Chunking consists of grouping separate bits of information. For example, the number 4671363 is more easily remembered if it is chunked as 467, 13, 63. Categorizing is another means of organization. Suppose you are asked to remember the following list of words: man, bench, dog, desk, woman, horse, child, cat, chair. Many people will group the words into similar categories and remember them as follows: man, woman, child; cat, dog, horse; bench, chair, desk. Needless to say, the second list can be remembered more easily than the first one. Association refers to taking the material we want to remember and relating it to something we remember accurately. In memorizing a number, you might try to associate it with familiar numbers or events. For example, the height of Mount Fuji in Japan -12,389 feet -might be remembered using the following associations: 12 is the number of months in the year, and 389 is the number of days in a year (365) added to the number of months twice (24). The last principle is visualization. Research has shown striking improvements in many types of memory tasks when people are asked to visualize the items to be remembered. In one study, subjects in one group were asked to learn some words using imagery, while the second group used repetition to learn the words. Those using imagery remembered 80 to 90 percent of the words, compared with 30 to 40 percent of the words for those who memorized by repetition. Thus forming an integrated image with all the information placed in a single mental picture can help us to preserve a memory. 1. What kind of information is easy for us to remember? A. Information that does not make any sense to us. B. Information that we are not familiar with. C. Information that is meaningful to us. D. Information that we are not interested in. 2. Which of the following pairs are rhymes? A. horse—house B. right---white C. come----home D. how---low 3.The second list of words in para.3 is organized according to . A. the rhyme B. the word category C. the first letters of words D. the meanings 4. Books are kept in a library . A. according to their size B. in random order C. in a jumbled way D. in different categories 5. What method can better help form a whole mental picture about the tings to be remembered? A. Grouping B. Repetition C. Imagery D. Association CBBDC Passage 3 One day, the principle(校长) came into our room and, after talking to the teacher, for some reason said: “I wish all of the white students to stand for a moment.” I rose with the others. The teacher looked at me and, calling my name, said: “You sit down for the present, and rise with the others.” I did not quite understand her. She repeated: “You sit down now, and rise with the others.” I sat down puzzled. I saw and heard nothing. When the other were asked to rise, I did not know it. When school was dismissed, I went out unconsciously. A few of the white boys laughed at me, saying: “Oh, you’re a nigger, too.” I hurried on as fast as I could to where my looking-glass hung on the wall in my own little room. For an instant I was afraid to look, but when I did, I looked long and earnestly. I was accustomed to hearing remarks about my beauty, but now, for the first time, I became conscious of it and recognized it. I noticed the ivory(象牙) whiteness of my skin, the beauty of my mouth, the size and the liquid darkness of my eyes. I ran downstairs and rushed to where my mother was sitting. I buried my head in her lap and cried out: “Mother, tell me, am I a nigger?” I could not see her face, but I felt her hands on my head. I looked up into her face. There were tears in her eyes and I could see that she was suffering for me. And then it was that. I looked at her critically for the first time. I had thought of her in a childish way only as the most beautiful woman in the world; now I looked at her searching for defects(缺点) .I could see that her skin was almost brown, and that she did differ in some way from the other ladies who came to the house; yet, even so I could see that she was more beautiful than any of them. She must have felt that I was examining her, for she hid her face in my hair and said with difficulty: “No, my darling, you are not a nigger.” She went on: “If anyone calls you a nigger, don’t notice them.” But the more she talked, the less was I reassured, and I stopped her by asking:“Well, mother, am I white? Are you white?” She answered tremblingly(颤抖的): “No, I am not white, but your father is one of the greatest men in the country. The best blood of the South is in you.” This suddenly opened up in my heart a fresh fear, and I almost fiercely demanded: “Who is my father? Where is he?” She stroked my hair and said: “I’ll tell you about him some day.” I sobbed(抽泣): “I want to know now.” She answered: “No, not now.” 1.We can infer from the passage that “a nigger ”means________. A. a white person B. a black person C. anyone that is not white D anyone that is not black 2.When the teacher asked him to sit down and rise with the others ,the author was confused because___. A. he never considered himself a non-white person B. he thought the teacher didn’t recognize him C. he thought he should be considered D. he thought it rude for the teacher to call his name 3.It was on that day that he began to realize that _________. A. he was a nigger B. he was different from others because of his beauty C. his color was like that of his mother D. he differed from other white people even with his beauty 4.From the passage we can learn that _________. A. the boy’s father left them for some reasons B. the boy’s mother didn’t want to mention his father at all C. the boy never met his father before D. the boy’s mother hated his father 5.This passage generally tells us a story of ________. A. a boy who suddenly realized that he was a colored person B. a boy who had been looked down upon because he had no father C. the miserable life of colored people D. the life of a one-parent family BADCA英语语音