—________ are the boys doing? —They are

惊蛰:清明

A．春分:雨水

B．立秋:白露

C．秋分:立冬

D．霜降:大雪

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______．

属于封闭区的是（）。

A.牙槽嵴顶

B.除硬区外的腭部

C.下颌磨牙后垫区

D.切牙乳突

E.下颌舌隆突

血中H⁺浓度升高引起呼吸加深加快是因为（）

A.直接刺激中枢的呼吸神经元

B.刺激中枢化学感受器

C.刺激颈动脉体和主动脉体感受器

D.刺激颈动脉窦和主动脉弓感受器

E.刺激心肺感受器

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