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问题 单项选择题

( )是我国项目经济评价中第一位的评价指标，也是国际上运用最多的评价指标之一。

A．投资回收期
B．净现值
C．净现值率
D．内部收益率

答案

参考答案：D

解析： 本题考查内部收益率。选项ABCD都属于项目经济评价指标，其中内部收益率是我国项目经济评价中第一位的评价指标。

填空题

现代入对生活品质的要求越来越高，对食品不仅要求色、香、味，还要求富含营养，食品添加剂应运而生．常用的食品添加剂有：

（1）防止食品腐败变质而添加的防腐剂：如苯甲酸（C6H5COOH）就是其中常用的防腐剂．苯甲酸由______种元素组成，它的一个分子中含有______个原子；

（2）为改善食品感官，厨房常备食盐、小苏打、蔗糖、食醋等，其中常用作膨松剂的是______；可用作甜味剂的是______；萧宏同学想用pH试纸检测食醋的pH值，他将pH试纸用水润湿，用筷子将食醋滴在pH试纸上，他测得的pH值将比实际结果______（填“大”、“小”或“相等”）；

（3）“盐卤点豆腐，一物降一物”这句俗语中的盐卤就是人们为改变食品状态而添加的凝固剂，盐卤的主要成分是氯化镁，海水中含有丰富的食盐和氯化镁，分离提纯过程如图所示：

根据图示回答：粗盐中含有大量泥沙，从粗盐提取精盐的实验步骤是______；

写出①、②两个反应的化学方程式

①______（温馨提示：看看溶解性表哦！）；

②______．

（4）下列（如图所示）食物中都添加了适量的营养补充剂，食用B食品可以有效预防______和______等疾病；氨基酸是组成______（填序号）

①糖类；②蛋白质；③油脂的基本单位，引用C饮料可以补充人体必需氨基酸．
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填空题

Motivation is "the driving force within individuals that impels them to action." And goals are the sought-after results_____(1) motivated behavior.Motivation can be either positive or negative_____(2) direction. We may feel a driving force toward some object or condition, _____(3) a driving force away from some object or condition. For example, a person may be impelled toward a restaurant to fulfill a need, hunger, and away_____(4) an airplane to fulfill a need of safety. Some psychologists refer to positive drives_____(5) needs, wants or desires,_____(6) negative drives as fears or aversions._____ (7), though negative and positive motivational forces seem to differ dramatically_____(8) terms of physical and sometimes emotional activity, they are basically similar in_____(9) they both serve to initiate and sustain human behavior.____(10) this reason, researchers often refer _____(11) both kinds of drives or motives as needs, wants and desires.Goals, _____(12), can be either positive or negative. A positive goal is one toward_____ (13) behavior is directed and it is often referred to as an approach object. A negative goal is _____(14) from which behavior is directed away and it is sometimes referred to as an avoidance object. Since both approach and avoidance goals can be considered objectives of motivated behavior, most researchers refer to_____(15) types simply as goals. Consider this example. A middle-aged woman may wish to remain_____(16) attractive as possible. Her positive goal is to appear desirable, and_____(17) she may use a perfume advertised to make her irresistible. A negative goal may be to prevent her skin_____(18) aging, and therefore she may buy and use face creams._____(19) the former case, she uses perfume to help her achieve her positive goal — attractiveness; in the____(20) case, she uses face creams to help avoid a negative goal — wrinkled skin.
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