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问题 选择题

下列说法正确的是

A．大部分糖类物质都符合Cn（H2O)m通式

B．有机物中是否含肽键可用茚三酮检验

C．氨基酸中加双缩脲试剂会呈现紫玫瑰色

D．蛋白质的一级结构、二级结构都是依靠氢键实现的

答案

答案：A

正确答案：A

A、正确；B、不正确，用茚三酮检测氨基酸；C、不正确，蛋白质和双缩脲试剂,呈紫色反应,用来检验蛋白质；D、蛋白质的一级结构就是蛋白质多肽链中氨基酸残基的排列顺序也是蛋白质最基本的结构，通过肽键连接起来，成为多肽链，故肽键是蛋白质结构中的主键。三级结构才有氢键作用。

多项选择题

目前已在海内外上市的国有独资商业银行是（）。

A、中国农业银行

B、中国工商银行

C、中国银行

D、中国建设银行
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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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