单选题食物中的营养物质有______类。 A.4 B.5 C.6 D.7

单选题骨干教师闵老师在年终的同行评测中测分不高，很郁闷，上课时学生出一点差错他就大发雷霆。闵老师应该()

单选题当前我国普通高中化学课程的宗旨是( )。

单选题探究学习是在20世纪( )美国掀起的“教育现代化运动”中，由美国著名科学家、芝加哥大学教授施瓦布倡导的。

单选题在讲授《两栖动物和爬行动物》一节时，教师可充分利用下列哪些无形的课程资源?( )①教材②动物园③学生饲养过小青蛙④学生参观过动物园⑤学生观看过《动物世界》⑥学校博物馆

单选题When we analyze the salt salinity (盐浓度) of ocean waters, we find that it varies only slightly from place to place. Nevertheless, some of these small changes are important. There are three basic processes that cause a change in oceanic salinity. One of these is the subtraction of water from the ocean by means of evaporation. In this manner, the salinity is increased, since the salt stays behind. If this is carried to the extreme, of course, white salt would be left behind; this, by the way, is how much of the table salt we use is actually obtained. The opposite of evaporation is precipitation, such as rain, by which water is added to the ocean. Here the ocean is being diluted so that the salinity is decreased. This may occur in areas of high rainfall or in coastal regions where rivers flow into the ocean. Thus salinity may be increased by the subtraction of water by evaporation, or decreased by the addition of fresh water by precipitation. Normally, in hot regions where the sun is very strong, the ocean salinity is somewhat higher than it is in other parts of the world where there is not as much evaporation. Similarly, in coastal regions where rivers dilute the sea, salinity is somewhat lower than in other oceanic areas. A third process by which salinity may be altered is associated with the formation and melting of sea ice. When seawater is frozen, the dissolved materials are left behind. In this manner, seawater directly beneath freshly formed sea ice has a higher salinity than it did before the ice appeared. Of course, when this ice melts, it will tend to decrease the salinity of the surrounding water. In the Weddell Sea, the densest water in the ocean is formed as a result of this freezing process, which increases the salinity of cold water. This heavy water sinks and is found in the deeper portion of the oceans of the world.

单选题()是我国古代最大的一部官修书，也是我国古代最大的一部丛书。

单选题教师在讲授完八年级下册第六单元的写作，口语交际·综合性学习课后，根据学到的“对联知识”，老师给学生出了以下几道试题： (1)从以下三个对联中选择一个送给一个即将过生日的朋友。 甲：三阳始布，四序初开。福庆初新，寿禄延长。 乙：回回故往，逐吉新来。年年多庆，月月无灾。 丙：交以道接以礼，近者悦远者来。 (2)试着给春节写一副简单的春联。 (3)试着从日常生活中搜集表达新婚、生日、春节、中秋等祝福的对联。 以下说法不正确的一项是______。

单选题常温下，下列各组离子在指定溶液中一定能大量共存的是( )。

单选题思想品德课中，老师组织了“枕头大战”的游戏活动，同学们自带枕头，互相击打，这种情境调控的方法是______。 A．注意转移 B．换位思考 C．合理宣泄 D．自我安慰

单选题在乡试、会试、殿试中的第一名分别称(　　)。

单选题幼儿在户外运动中扭伤，出现充血、肿胀和疼痛，教师应对幼儿采取的措施是()。

单选题下列关于类、对象、属性和方法的叙述中，错误的是______。 A.类是对一类具有相同的属性和方法的对象的描述 B.属性用于描述对象的状态 C.方法用于表示对象的行为 D.基于同一个类产生的两个对象不可以分别设置自己的属性值

单选题美术教科书内容的选择应注意基础性、______、应用性和拓展性，能引发学生产生问题，促进学生的思考和探究。 A.时代性 B.美观性 C.实用性 D.启发性

单选题读“木桶效应(组成木桶的木板如果长短不齐，那么这只木桶的盛水量，不取决于最长的那一块木板，而是取决于最短的那一块)图”，完成问题。

单选题下列属于课堂导入要求的是______。 A.科学性原则 B.相关性原则 C.启发性原则 D.三者都是

单选题著名短篇小说《套中人》的作者是( )。

单选题我国采用班级授课制最早是在()年的京师同文馆。

单选题中国四大名楼中，不是位于长江以南的是()。

单选题下列人物中，既是诗人也是画家的是()。