单选题The first man who cooked his food, instead of eating it raw, lived so long ago that we have no idea who he was or where he lived. We do know, however, that (1) thousands of years food was always eaten cold and (2) . Perhaps the cooked food was heated accidentally by a (3) fire or by the melted lava from an erupting (4) . When people first tasted food that had been cooked, they found it tasted better. However, (5) after this discover, cooked food must have remained a rarity (6) man learned how to make and light (7) . Primitive men who lived in hot regions could depend on the heat of the sun (8) their food. For example, in the desert (9) of the southwestern. United States, the Indians cooked their food by (10) it on a flat (11) in the hot sun. They cooked piece of meat and thin cakes of com meal in this (12) . We surmise that the earliest kitchen (13) was stick (14) which a piece of meat could be attached and held over a fire. Later this stick was (15) by an iron rod or spit which could be turned frequently to cook the meat (16) all sides. Cooking food in water was (17) before man learned to make water containers that could not be (18) by fire. The (19) cooking pots were reed or grass baskets in which soups, and stews could be cooked. As early as 166 B. C, the Egyptians had learned to make (20) permanent cooking pots out of sand stone. Many years later, the Eskimos learned to make similar pans.

单选题如果等成本曲线在坐标平面上与等产量曲线相交，那么要生产等产量曲线表示的产量水平( )

单选题商品使用价值、交换价值和价值的关系是

单选题以下不属于财政职能基本内容的是__________。 　　①资源配置职能 ②收入分配职能 ③汇率调整职能 　　④劳动就业职能 ⑤经济发展职能 ⑥经济稳定职能

单选题下列选项中属于固定资产的是（ ）

单选题As Eleanor Roosevelt once said, "Universal human rights begin in small places, close to home." And Tolerance. org, a Web site from the Southern Poverty Law Center, is helping parents across the country create homes in which tolerance and understanding are guiding themes. "The goal of nurturing open-minded, empathetic children is a challenging one," says Jennifer Holladay, director of Tolerance. org. "To cultivate tolerance, parents have to instill in children a sense of empathy, respect and responsibility—to oneself and to others—as well as the recognition that every person on earth is a treasure." Holladay offers several ways parents can promote tolerance: Talk about tolerance. Tolerance education is an ongoing process; it cannot be captured in a single moment. Establish a high comfort level for open dialogue about social issues. Let children know that no subject is taboo. Identify intolerance when children are exposed to it. Point out stereotypes and cultural misinformation depicted in movies, TV shows, computer games and other media. Challenge bias when it comes from friends and family members. Do not let the moment pass. Begin with a qualified statement: "Andrew just called people of XYZ faith 'lunatics. ' What do you think about that, Zoe?" Let children do most of the talking. Challenge intolerance when it comes from your children. When a child says or does something that reflects biases or embraces stereotypes, confront the child: "What makes that joke funny, Jerome?" Guide the conversation toward internalization of empathy and respect—"Mimi uses a walker, honey. How do you think she would feel about that joke?" or "How did you feel when Robbie made fun of your glasses last week?" Support your children when they are the victims of intolerance. Respect children's troubles by acknowledging when they become targets of bias. Don't minimize the experience. Provide emotional support and then brainstorm constructive responses. For example, develop a set of comebacks to use when children are the victims of name-calling. Create opportunities for children to interact with people who are different from them. Look critically at how a child defines "normal." Expand the definition. Visit playgrounds where a variety of children are present—people of different races, socioeconomic backgrounds, family structures, etc. Encourage a child to spend time with elders—grandparents, for example. Encourage children to call upon community resources. A child who is concerned about world hunger can volunteer at a local soup kitchen or homeless shelter. The earlier children interact with the community, the better. This will help convey the lesson that we are not islands unto ourselves. Model the behavior you would like to see. As a parent and as your child's primary role model, be consistent in how you treat others. Remember, you may say, "Do as I say, not as I do," but actions really do speak louder than words.

单选题在反映战国到秦朝这一时期的电影《英雄》和《刺秦》中，许多骑马打仗的镜头不符合历史的真实情况。今天看到的秦兵马俑，绝大多数战马是没有马鞍的，有马鞍的战马一律没有马镫。没有马镫，士兵在马背上就坐不住，也使不上劲，所以当时的骑兵没法在马上打仗。以下哪一个选项是上述论证所依赖的假设?

单选题下列( )不包括在GDP里面。

单选题资本积累的两个社会经济后果是（ ）。

单选题为参加大学生辩论赛，某高校在P、Q、R和S四名候选人中选拔辩手。 以下条件必须满足： (1)P必须入选。 (2)如果P和Q都入选，那么R要被淘汰。 (3)R和S不能都淘汰。 (4)只有P被淘汰，S才入选。 由上述断定可推出被淘汰的候选人是______

单选题导致“谷贱伤农”的根本原因是

单选题设A，B都是n阶非零矩阵，且AB=O，则矩阵A和矩阵B的秩______．

单选题 造成投资曲线水平移动的原因不包括（ ）。 A、厂商预期 B、风险偏好 C、银行利率 D、政府投资

单选题资本主义企业的分配制度是（ ）为基础的。

单选题某消费者对商品1和商品2的效用函数为min(3x 1 ，x 2 )，则在改消费者看来。两种商品属于( )

单选题政治经济学的出发点是（ ）。