在E-R图中,矩形表示()。

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问题:

在E-R图中,矩形表示()。

考点:计算机等级考试ACCESS全国计算机等级考试二级ACCESS真题2007年9月
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求“130乘16与23的和,积是多少?”写成综合算式是______,这个算式要先算______.

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已知函数y=x2(x>0)的图象在点(ak,ak2)处的切线与x轴的交点的横坐标为ak+1(k∈N*),a1=1;数列{bn}满足:b1=2,且对任意p,q∈N*,都有bp+bq=bp+q

(Ⅰ)求数列{an}、{bn}的通项公式;

(Ⅱ)求数列{an·bn}的前n项和Tn

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下列说法正确的是

A.电离是电解质离解成能够自由移动的离子的过程,与是否通电无关

B.有单质参加的反应,均为氧化还原反应

C.阿伏加德罗常数是6.02×1023

D.氢氧化铝是两性氢氧化物,氧化铝是两性氧化物,铝也是两性金属

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Little _______ what you said. I wish you repeated it.

A.I understand

B.did I understand

C.I did understand

D.have I understood

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The appeal of advertising to buying motives can have both negative and positive effects. Consumers may be convinced to buy a product of poor quality or high price because of an advertisement. For example, some advertisers have appealed to people’s desire for better fuel economy for their cars by advertising automotive products that improve gasoline mileage. Some of the products work. Others are worthless and a waste of consumers’ money.

Sometimes advertising is intentionally misleading. A few years ago a brand of

bread was offered to dieters (节食者) with the message that there were fewer calories in every slice. It turned out that the bread was not dietetic (适合于节食的), but just regular bread. There were fewer calories because it was sliced very thin, but there were the same number of calories in every loaf.

  On the positive side, emotional appeals may respond to a consumer’s real concerns. Consider fire insurance. Fire insurance may be sold by appealing to fear of loss. But fear of loss is the real reason for fire insurance. The security of knowing that property is protected by insurance makes the purchase of fire insurance a worthwhile investment for most people. If consumers consider the quality of the insurance plans as well as the message in the ads, they will benefit from the advertising.

  Each consumer must evaluate her or his own situation. Are the benefits of the product important enough to justify buying it? Advertising is intended to appeal to consumers, but it does not force them to buy the product. Consumers still control the final buying decision.

56. Advertising can persuade the consumer to buy worthless products by _________.

  A. stressing their high quality

  B. convincing him of their low price

  C. maintaining a balance between quality and price

  D. appealing to his buying motives

57. The reason why the bread advertisement is misleading is that ________.

  A. thin slices of bread could contain more calories

  B. the loaf was cut into regular slices

  C. the bread was not genuine bread

  D. the total number of calories in the loaf remained the same

58. The passage tells us that _______.

  A. sometimes advertisements really sell what the consumer needs

  B. advertisements occasionally force consumers into buying things they don’t need

  C. the buying motives of consumers are controlled by advertisements

  D. fire insurance is seldom a worthwhile investment

59. It can be inferred from the passage that a smart consumer should ________.

  A. think carefully about the benefits described in the advertisements

  B. guard against the deceiving nature of advertisements

  C. be familiar with various advertising strategies

  D. avoid buying products that have strong emotional appeal

60. The passage is mainly about ________.

  A. how to make a wise buying decision

  B. ways to protect the interests of the consumer

  C. the positive and negative aspects of advertising

  D. the function of advertisements in promoting sales

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