单选题科学探究中猜想与假设的含义是______。 A.根据对问题的逻辑分析找到问题的所有可能的答案 B.以个人的直觉为主要依据，对问题成因和可能出现的结果所进行的发散性思维 C.是根据个人的经验对问题的成因和可能出现的结果进行的随意的设想 D.以个人的经验、相关知识和科学事实为依据，对问题的成因和可能出现的结果进行猜想

单选题《国家中长期教育改革与发展规划纲要(2010-2020)》提出，教育改革发展的战略主题是(　　)

单选题下列哪种类型文件可以存储多媒体动画？( )

单选题收留夜不归宿的未成年人的，应当征得其父母或者其他监护人的同意，或者在______内及时通知其父母或者其他监护人、所在学校或者及时向公安机关报告。 A.12小时 B.18小时 C.24小时 D.36小时

单选题1914年美国生物学家(　　)创立了染色体——遗传基因理论，由此细胞遗传学有了坚实的基础。

单选题10岁以后，儿童在人与人的关系上，从权威性过渡到平等性，根据皮亚杰的道德发展阶段理论，中学生的道德发展处于哪一阶段?()

单选题下列对世界科技革命的说法不成立的是()。

单选题按功能分，教学评价不包括______。

单选题赫尔巴特指出：“我想不到有任何无教学的教育，正如在相反方面，我不承认有任何无教育的教学。”这说明了教学过程具有什么特点?()

单选题运动员疾跑后不能立即站立不动，需继续慢跑的原理是______。 A.防止低血糖的发生 B.有利于心功能的恢复 C.有利于氧债的偿还 D.防止重力性休克

单选题我国是多民族国家，许多民族用史诗、叙事诗，以及传唱等方式，歌颂本民族的英雄或传说人物。下列选项中属于蒙古族的是()

单选题下列反应中符合下述两个图象的是()。

单选题按顺序呈现“护士、兔子、月亮、救护车、胡萝卜、太阳”的图片让幼儿记忆，有些幼儿回忆时说：“刚才看到了救护车和护士、兔子和胡萝卜，还有太阳和月亮。”这些幼儿运用的记忆策略是()。

单选题三国鼎立局面最终形成的时间是()。

单选题If a teacher gets an incorrect answer from students，it is most appropriate for him or her to say“__________”in order to encourage them．

单选题为了让幼儿在户外活动中能一物多玩，最适宜的方法是()

单选题《玩偶之家》的作者是()。

单选题下列儒家经典，不是由孔子编订、整理的是( )。

单选题Labor Day is a national holiday in the United States. It has been celebrated on the first Monday in September since the 1880s in order to honor the country' s workers. Today, it is a family holiday. Many people go on a picnic to the beach, the lake, or the mountains. But the first Labor Day celebration was not about family or fun. Instead, it was about making life better for America's working class. In America workers were not always treated well. In the early days of the 1880s, hundreds of new immigrants from Europe came to the United States every day. Most spent all their money getting to America. By the time they arrived, they would take any job they could find. They worked for very little pay. Owners of businesses and factories often took advantage of the situation. They were able to get a lot of labor for little money. They expected their employees to work 10 to 14, even 16 hours a day. What's more, jobs were often dangerous. Even children worked in situations where a mistake could mean death. Women and children worked for lower wages than men, and owners employed them for this reason. In the 1880s, the fight for worker's rights was led by men who were workers themselves. They organized the workers into labor unions. The American Federation of Labor(AFL)was organized in 1886. Later the Congress of Industrial Organizations(CIO)was founded. Wages, hours of labor, and working conditions have improved since that time. Labor unions have persuaded the federal and state governments to pass laws that limit how many hours a week people can be required to work and decide what the minimum wage should be. They have determined that child labor, as well as unfair treatment based on sex, religion, color, and national origin is now illegal. Strikes occur when workers feel that their employer is behaving unfairly. In order to celebrate their early successes, Labor Day was started in 1882 by a union called the Knights of Labor. On the first Labor Day, a long parade was held in New York City, followed by a festival for the workers and their families. By 1894, Congress had recognized it as a national holiday and it is still celebrated today.

单选题The______ of the system of regional autonomy for ethnic minorities has underground long periods of exploration and practice.