试题与答案

现代生活中,人们越来越重视对微量元素的平衡摄入。幼儿缺碘元素,会造成痴呆、发育不

题型:填空题

题目:

现代生活中,人们越来越重视对微量元素的平衡摄入。幼儿缺碘元素,会造成痴呆、发育不良;成人缺碘会患地方性甲状腺肿大。为控制该病的发生,有效的方法是食用加碘食盐。我国卫生部规定每千克食盐中应含有40-50mg的碘酸钾。

(1)碘是合成______________的主要原料之一。

A.胰岛素 B.甲状腺激素 C.生长激素

(2)加碘食盐包装袋上通常印有如下建议:“菜未熟不宜加入碘盐”。请简述其中所包含的化学原理_________________。

(3)已知KIO3可用电解方法制得。其原理是:以石墨为阳极,以不锈钢为阴极,在一定电流强度和温度下电解KI溶液。总反应方程式为KI+3H2OKIO3+3H2↑,则此反应中氧化剂为________________,还原剂为_________________。

(4)为检验某食盐中是否含有碘酸钾,某同学取食盐样品428g溶解后,加入盐酸酸化的淀粉碘化钾溶液, 溶液呈蓝色。涉及的化学方程式为KIO3+5KI+6HCl=3I2+3H2O+6KCl,此反应的离子方程式为________________________,氧化产物与还原产物的物质的量之比为________________。

答案:

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Part 4


Questions 26-45


·Read the following passage and choose the best word for each space.
Money spent on advertising is money spent as well as any (26) know of. It serves directly to assist a rapid of goods at reasonable prices, (27) establishing a firm home market and so making it possible to provide (28) export at competitive prices. By drawing attention to new ideas it helps enormously to raise standards of living. By helping to increase demand it (29) an increasing need for labor, and is therefore an effective way to fight unemployment. It lowers the costs of many services: (30) advertisements your daily newspaper would cost four times as much, the price of your television license would need to be doubled, and travel by bus or tube would cost 20 percent more.
And perhaps most important of all, advertising provides a guarantee of reasonable value in the products and services you buy (31) the fact that twenty-seven Acts of Parliament govern the terms of advertising, no regular advertiser dare promote a product that fails to live (32) the promise of his advertisements. He might fool some people for a little (33) through misleading advertising. He will not do so for long, for mercifully the public has the good (34) not to buy the inferior article more than once. If you see an article (35) advertised, it is the surest proof. I know that the article does what is (36) for it, and that it represents good value.
Advertising does more for the (37) benefit of the community than any other force I can think of.
There is one more point I feel I ought to (38) on. Recently I heard a well-known television personality (39) that he was against advertising because it persuades rather than informs. He was drawing (40) fine distinctions. Of course advertising (41) to persuade.
If its message were (42) merely to information—and that in itself (43) difficult if not impossible to achieve, (44) even a detail such as the choice of the color of a shirt is subtly persuasive — advertising would be so boring (45) no one would pay any attention. But perhaps that is what the well-known television personality wants.

A.confessed

B.confined

C.confided

D.restrained

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