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下列事实分别说明分子具有什么样的特点？

（1）一滴水里的分子个数约为1.67×1021个

（2）湿衣服晒一段时间就会变干

（3）打气筒能将空气压入足球内．

答案

（1）一滴水里的分子个数约为1.67×1021个，说明分子的体积和质量很小；

（2）湿衣服晒一段时间就会变干，是由于水分子在不断运动，不断向空气中扩散，所以湿衣服晒一段时间就会变干；

（3）打气筒能将空气压入足球内，说明分子之间有间隔，增大压强，分子之间的间隔变小，体积变小，所以说明了分子之间有间隔．

故答案为：分子很小；分子是在不断运动的；分子间有间隔．

单项选择题

一般来讲，对那些容易和其他同类产品相区别，也较难在加工中形成一定特色的产品，如食盐、白糖等可应用______策略。

A．无品牌
B．品牌归属
C．群体品牌
D．单一品牌重点
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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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