单选题下列说法中正确的是()A零下18℃的液体能发生汽化现象B发生扩散现象的原因是气体分子不停地做无规则运动C烧水时常看到“白气”,从水到“白气”的物态变化是先液化后汽化D寒冷的冬夜,家里窗户玻璃上的“冰花”,是由于室外空气中的水蒸气凝华形成的
单选题
下列说法中正确的是()
A
零下18℃的液体能发生汽化现象
B
发生扩散现象的原因是气体分子不停地做无规则运动
C
烧水时常看到“白气”,从水到“白气”的物态变化是先液化后汽化
D
寒冷的冬夜,家里窗户玻璃上的“冰花”,是由于室外空气中的水蒸气凝华形成的
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单选题Passage1Soon after starting his job as superintendent of the Memphis,Tenn.,public schools,Kriner Cash ordered an assessment of his new district's 104,000 students. The findings were depressing:nearly a third had been held back at least one academic year. The high school graduation rate had fallen to 67%.One in five dropped out. But what most concerned him was that the number of students considered highly mobile,meaning they had moved at least once during the school year,had ballooned to 34,000,partly because of the home-foreclosure crisis. At least 1,500 students were homeless-probably more.I had a whole array of students who were angry,depressed,not getting the rest they needed,Cash says. It led him to consider an unusual proposition: What if the best way to help kids in impoverished urban neighborhoods is to get them out?Cash is now calling for Memphis to create a residential school for 300 to 400 kids whose parents are in financial distress,with a live-in faculty rivaling those of elite New England prep schools. If Cash's dream becomes a reality,it will probably look a lot like SEED,a charter school in Southeast Washington,which stands for Schools for Educational Evolution and Development. Its 320 students-seventh-to 12th-graders-should live on campus five days a week. They are expected to adhere to a strict dress code and keep their room tidy. There are computers in the dorm's common areas, and each student in grades 10 and above is given a desktop computer. At 11:30 every night it's lights out.In his plan for Memphis, Cash wants even more time. Perhaps the most provocative aspect of his proposal is to focus on students in grades 3 through 5 for homelessness is growing sharply among kids at that critical age, when much of their educational foundation is set, Cash says. His aim: to prevent illiteracy and clear other learning roadblocks early, so the problem won't migrate into middle and high school. Students will remain on campus year-round. The school would cost up to S50,000 a day to operate-three times the cost of a traditional day school with more than twice as many students.It sounds very exciting, but the devil is in the details. says Ellen Bassuk, president of the National Center on Family Homelessness in Newton, Mass.Why does Cash want to concentrate on students from the third to the fifth grade?AMore children at that critical age become homeless.BChildren at that age have more problems.CThat age is very important for learning.DIt is the best time to build educational foundation.
单选题太平天国前期,英国代表声称:英国“绝不左袒中国政府”表示要恪守“中立”,同时把《南京条约》的文本抄送给太平天国。英国政府的主要意图是()A支持太平天国政权B维护侵华权益C宣示英国主导地位D承认两个政权
单选题For better classroom management,what should the teacher do while the students are doing activities?AParticipating in a group.BPreparing for the next procedure.CMoving around to monitor,prompt students and provide help.DStanding in front of the class.
单选题Passage2The way people work has changed. The increasing use of technology presents new and continual challenges to small and large businesses,employees and managers,teachers and students.Everyone,it seems,is being affected by the technological revolution. Store clerks,for example,now use increasingly complex computerized cash registers,while university professors must learn to adapt their teaching skills in order to lead distance learning course.In today's world,training and learning do not stop when we finish school;they must now continue throughout our working lives. The Hong Kong government conducted a survey on the employment concerns,and training needs of its workforce. For many managers and other professionals the biggest challenge,as well as change,in the workplace,was the increased use of computers and computerized machinery or equipment. The need for experienced employees who could use this kind of equipment rose drastically. Many of those in the workplace at this time experienced changes in job requirements and had to attend job-related training or re-training courses.The changing work environment is also affecting education and how we learn. In Finland, a report on strategies for education and training in the information age discussed the changing roles of both teacher and student. With the increased use of technology and the growth of distance learning, the teacher has become more of a tutor who guides a student, rather than a lecturer. In turn, the student has to take more responsibility for his or her learning in the absence of direct teacher contact. The report also stressed that high school and university students should learn computer skills in order to cope with the demands of the future workplace.The Finnish report also highlighted the need for teacher training, and re-training, and suggested that the salaries and job descriptions of teachers be reviewed because of future demands expected in their jobs. Previously university professors may have held lectures between the weekday hours of 9:00A.M. and 5:00 P.M. in large halls filled with students. Now, they may spend part of their day lecturing larger groups of students on campus, and then conduct afternoon or evening classes online, with students in five different countries.As technologies grow and develop, ongoing training will continue to be necessary. To be successful in the workplace, people will not stop learning when they leave school-lifelong learning will become a way of life.From the first paragraph of the passage we know that_______.Aeveryone has to learn how to use complex computersBtechnological revolution has brought changes to people's workCthe use of new technology has got small business into large onesDeven university professors have to learn the new technology in distance courses
单选题A Their requests about more clues.B Their tremendous interest in the game.C Their news about getting their f'amily closer.D Their numerous emails about their perseverance.
单选题Passage 2The subject of ballads, books and films, Robin Hood has proven to be one of popular culture's most enduring folk heroes. Over the course of 700 years, the outlaw from Nottinghamshire who robs the rich to give to the poor has emerged as one of the most enduring folk heroes in popular culture--and one of the most versatile. But how has the legend of Sherwood Forest's merry outlaws evolved over time? Did a real Robin Hood inspire these classic tales?Beginning in the 15th century and perhaps even earlier, Christian revelers in certain parts of England celebrated May Day with plays and games involving a Robin Hood figure with near-religious significance. In the 19th century, writer-illustrators like Howard Pyle adapted the traditional tales for children, popularizing them in the United States and around the world. More recently, bringing Robin to the silver screen has become a rite of passage for directors ranging from Michael Curtiz and Ridley Scott to Terry Gilliam and Mel Brooks.Throughout Robin's existence, writers, performers and filmmakers have probed their imaginations for new incarnations that resonate with their respective audiences. In 14th-century England, where agrarian discontent had begun to chip away at the feudal system, he appears as ananti-establishment rebel who murders government agents and wealthy landowners. Later variations from times of less social upheaval dispense with the gore and cast Robin as a dispossessed aristocrat with a heart of gold and a love interest, Maid Marian.Academics, meanwhile, have combed the historical record for evidence of a real Robin Hood. English legal records suggest that, as early as the 13th century, Robehod, Rabunhod and other variations had become common epithets for criminals. But what had inspired these nicknames: a fictional tale, an infamous bandit or an amalgam of both? The first literary references to Robin Hood appear in a series of 14th-and 15th-century ballads about a violent yeoman who lived in Sherwood Forest with his men and frequently clashed with the Sheriff of Nottingham. Rather than a peasant, knight or fallen noble, as in later versions, the protagonist of these medieval stories is a commoner. Little John and Will Scarlet are part of this Robin's merry crew-meaning, at the time, an outlaw's gang-but Maid Marian, Friar Tuck and Alan-a-Dale would not enter the legend until later, possibly as part of the May Day rituals.While most contemporary scholars have failed to turn up solid clues, medieval chroniclers took for granted that a historical Robin Hood lived and breathed during the 12th or 13th century. The details of their accounts vary widely, however, placing him in conflicting regions and eras. Not until John Major's History of Greater Britain (1521), for example, is he depicted as a follower of King Richard, one of his defining characteristics in modern times.We may never know for sure whether Robin Hood ever existed outside the verses of ballads and pages of books. And even if we did, fans, young and old, would still surely flock to England's Nottinghamshire region for a tour of the legend's alleged former hangouts, from centuries-old pubs to the Major Oak in Sherwood Forest. What we do know is that the notion of a brave rebel who lives on the outskirts of society, fighting injustice and oppression with his band of companions, has universal appeal-whether he's played by Erroll Flynn, Russell Crowe or even, as on a 1979 episode of The Muppet Show, Kermit the Frog.Which of the following is closest in meaning to the underlined phrase a rite of passage in Paragraph 2?AA milestone event.BA top agenda.CA religious ceremony.DA privileged right.
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问答题阅读下面的教学案例,完成问题。某初中语文教师,在执教臧克家的《老马》时,要求学生用两个成语概括“老马”的形象。这个设计相当不错,因此激发了学生的解答欲望,短短2分钟里,提出了10多个成语,什么“逆来顺受”“精疲力竭”“百折不挠”“负重致远”“心地善良”“心力交瘁”“槁项黄馘”(此成语笔者课后查了词典才解其意,觉得十分贴切),结果都被教师一一否定,最后教师公布答案:忍辱负重,忠厚善良。而且要求学生必须记住。有专家问执教的老师:“你们不是在搞‘多元教学’的课题吗?为什么学生说出那么多成语,你都不予肯定呢?”该教师坦承道:“研究归研究,做归做,解读可以‘多元’,但答案只有一个。我不能让学生冒‘多元’风险。”他又补充了一句:“你别看现在大家都在喊‘多元教学’,真正能做到的依我看一个都没有。”你对该教师的回答有什么看法?
单选题A 氢原子从n=2跃迁到n=1的能级时,辐射光的波长大于656nmB 用波长为325nm的光照射,可使氢原子从n=1跃迁到n=2能级C 一群处于n=3能级上的氢原子向低能级跃迁时最多产生两种谱线D 用波长为633nm的光照射时,不能使氢原子从n=2跃迁到n=3能级
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单选题桌面上有一倒立的玻璃圆锥,其顶点恰好与桌面接触,圆锥的轴(图中虚线)与桌面垂直,过轴线的截面为等边三角形,如图6所示。有一半经为r的圆柱形平行光束垂直入射到圆锥的底面上,光束的中心轴与圆锥的轴重合。已知玻璃的折射率为1.5,则光束在桌面上形成的光斑半径为( )。A rB 1.5rC 2rD 2.5r
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