对比dB和dBm说明二者的区别有哪些？

下列各句中，加点的成语使用正确的一句是 （ ）

A．电动车车主要考驾照的消息一传出，立刻成为人们谈论的热点，街头巷尾，闹得纷纷扬扬。

B．新华社评出的2009年度十一大热点人物，职业不同，性格各异。他们的不同表现折射出社会生活的千姿百态。

C．据说，奥巴马夫妇是苏珊大妈的粉丝，欲邀请苏珊大妈赴白宫演出，而苏珊大妈以害羞为由，迟迟不肯前去，成为白宫的不速之客。

D．上海房价骤增，到2009年12月7日每平米已经超过2万元，这令普通百姓叹为观止。他们只好把目光转向价格相对便宜的城乡结合部。

生物体建造自己生命大厦的蓝图储存在细胞的什么结构内．（　　）

A．细胞壁

B．细胞膜

C．细胞质

D．细胞核

血浆标本采集时，防止血液凝固应做到（）。

A.用干燥注射器

B.将血液快速注入试管内

C.用干燥试管

D.用抗凝试管

E.用干燥针头

In the following passage, there are 25 blanks representing words that are missing from the context. You are to put back in each of the blanks the missing word. Write your answers on the ANSWER SHEET. The time for this section is 25 minutes.
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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