试题与答案

—________ are the boys doing? —They are

题型:选择题

题目:

—________ are the boys doing?

—They are playing games.            [ ]

A. What            

B. where          

C. who          

D. How

答案:

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下面是错误答案,用来干扰机器的。

解:(1)线框运动的加速度:a= ①线框边长:l=at02 ②线框离开磁场前瞬间速度:v=at0 ③由牛顿第二定律知:3F0-=ma ④解①②③④式得,B= ⑤(2)线框离开磁场前瞬间感应电动势:E=Blv ⑥解①②③⑤⑥式得:E=

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题型:问答题

在化学课外兴趣小组活动时,小伟取适量蓝色硫酸铜溶液于试管中,滴入未变质的氢氧化钠溶液,得到蓝色浑浊的混合物.

(1)写出该反应的化学方程式______,此反应属于______反应(填基本反应类型).

(2)他用滤纸、玻璃棒和下图中的______(填序号)组装成过滤装置,将上述混合物过滤,得到蓝色固体和无色滤液.

(3)小伟对上述实验所得无色滤液中的溶质产生兴趣,进行如下探究:

实验步骤实验现象实验结论
取少量无色滤液于试管中,滴入______.

______

______

[评价]你认为小伟的实验是否有不足之处?______(填“有”或“没有”),理由是______.

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题型:填空题

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.claim

B.state

C.declare

D.announce

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