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问题 选择题

下列人体体液中酸性最强的是

 ABCD
体液唾液血液胆汁胃液
pH范围6.6~7.17.35~7.456.8~7.40.8~1.5
 

答案

答案：D

分析：当溶液的PH等于7时，呈中性．当溶液的PH大于7时，呈碱性．当溶液的PH小于7时，呈酸性．

当溶液的PH＜7时，随着PH的减小酸性增强．

解：A、唾液的PH是6.6-7.1，呈中性、弱碱性或弱酸性．故选项错误；

B、血液的PH是7.35-7.45，呈弱碱性．故选项错误；

C、胆汁的PH是6.8-7.4，呈中性、弱碱性或弱酸性．故选项错误；

D、胃液的PH是0.8-1.5，酸性很强．故选项正确．

故选D．

点评：解答本题要充分理解溶液的酸碱性和溶液PH大小之间的关系，只有这样才能对相关方面的问题做出正确的判断．

单项选择题

利率风险按照来源的不同，可以分为重新定价风险、（）、基准风险和期权性风险。

A.操作风险

B.未来风险

C.预期风险

D.收益率曲线风险
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填空题

Some consumer researchers distinguish (1) "rational" motives and "emotional" (or "non-rational") motives. They use the term "rationality" (2) the traditional economic sense that assumes (3) consumers behave rationally when they carefully consider all alternatives (4) choose those that give them the greatest utility (i.e., satisfaction). (5) a marketing context, the term "rationality" implies that the consumer selects goods based (6) totally objective criteria, such (7) size, weight, price, and so on. "Emotional" motives imply the selection of goods (8) to personal or subjective criteria—the desire (9) individuality, pride, fear, affection or status.
The assumption underlying this distinction is (10) subjective or emotional criteria do not maximize utility or satisfaction. (11) , it is reasonable to assume that consumers always attempt to select alternatives that, (12) their view, serve to maximize satisfaction. Obviously, the assessment of satisfaction is a very personal process, based (13) the individual’s own needs as (14) as on past behavioral, social, and learning experiences. What may appear (15) irrational to an outside observer may be perfectly rational (16) the context of the consumer’s own psychological field. For example, a product purchased to enhance one’s self-image (such as a fragrance) is a perfectly rational form of consumer behavior. (17) behavior did not appear rational to the person who undertakes it (18) the time that it is undertaken, obviously he or she would not do it. (19) the distinction between rational and emotional motives does not appear to be warranted.
Some researchers go so far (20) to suggest that emphasis (21) "needs" obscures the rational, or conscious, nature of most consumer motivation. They claim that consumers act consciously (22) maximize their gains and minimize their losses; that they act not (23) subconscious drives but from rational preferences, (24) what they perceive to be (25) their own best interests.
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