在关系数据库中，用来表示实体之间联系的是( )。A) 树结构 B) 网结构C) 线

消费者对出版物的需求，是推动其消费行为产生的动力。

土地市场供需调控的措施中，财政政策在调节土地市场发展速度和供求关系上发挥着重要的作用，主要有（）。

A.地租政策

B.税收政策

C.财政投资政策

D.管理政策

E.金融政策

甲型H1N1流感为急性呼吸道传染病，其病原体是一种新型的甲型H1N1流感病毒．甲型H1N1流感最初发现于2009年3月，在墨西哥暴发．据中国卫生部通报，截至2010年1月10日，中国内地已有124764例甲型H1N1流感确诊病例，其中744例死亡．人感染甲流后的早期症状与普通流感相似，包括发热、咳嗽、喉痛、身体疼痛、头痛、发冷和疲劳等，有些还会出现腹泻或呕吐、肌肉痛或疲倦、眼睛发红等．甲型H1N1流感的群间传播主要是以感染者的咳嗽和喷嚏为媒介，要防止受到感染，应避免与有流感样症状的人密切接触，并采取下列措施：用肥皂和水彻底清洗双手，或者定期使用含酒精的手擦清结双手；开窗通风，增加室内空气流动；保持良好的卫生习惯等．目前我国已经批量生产甲型流感疫苗，为易感人群接种疫苗确定了接种原则：要首先保护最为易感和脆弱的人群，特别是中学生；有基础性疾病的人；一线的公共服务人员．

请根据资料回答问题：

（1）导致甲型H1N1流感的病原体是______，它是由______构成的．

（2）有发病症状的人应该迅速送去医院隔离治疗属于预防传染病的______措施．用肥皂和水彻底清洗双手，或者定期使用含酒精的手擦清结双手；开窗通风，增加室内空气流动；保持良好的卫生习惯属于预防传染病的______措施．

（3）甲型H1N1流感康复患者能抵抗流感的再次侵袭，是因为在他们体内已经存在了______．应该注射疫苗的是______．甲型H1N1流感疫苗在免疫学上属于______．注射疫苗预防疾病属于______免疫．

（4）接种过疫苗的人______（能或者不能）将性状遗传给下一代，为什么？______．

Many things make people think artists are weird—the odd hours, the nonconformity, the clove cigarettes. However, the weirdest may be this: artists’ only jobs are to explore emotions, and yet they choose to focus on the ones that feel lousy. This wasn’t always so. The earliest forms of art, like painting and music, are those best suited for expressing joy. But somewhere in the 19th century, more artists began seeing happiness as insipid, phony or, worst of all, boring. In the 20th century, classical music became more atonal, visual art more unsettling.

Sure, there have been exceptions, but it would not be a stretch to say that for the past century or so, serious art has been at war with happiness. In 1824, Beethoven completed his " Ode to Joy " . In 1962, novelist Anthony Burgess used it in A Clockwork Orange as the favorite music of his ultra-violent antihero.

You could argue that art became more skeptical of happiness because modem times have seen such misery. But the reason may actually be just the opposite: there is too much happiness in the world today.

In the West, before mass communication and literacy, the most powerful mass medium was the church, which reminded worshippers that their souls were in peril and that they would someday be meat for worms. Today the messages that the average Westerner is bombarded with are not religious but commercial, and relentlessly happy. Since these messages have an agenda—to pry our wallets from our pockets—they make the very idea of happiness seem bogus. " Celebrate! " commanded the ads for the arthritis drug Celebrex, before we found out it could increase the risk of heart attack.

What we forget—what our economy depends on us forgetting—is that happiness is more than pleasure without pain. The things that bring the greatest joy carry the greatest potential for loss and disappointment. Today, surrounded by promises of easy happiness, we need someone to tell us that it is OK not to be happy, that sadness makes happiness deeper. As the wine connoisseur movie Sideways tells us, it is the kiss of decay and mortality that makes grape juice into Pinot Noir. We need art to tell us, as religion once did, that you will die, that everything ends, and that happiness comes not in denying this but in living with it. It’s a message even more bitter than a clove cigarette, yet, somehow, is a breath of fresh air.

The word " Celebrex " in the advertisement（）

A. misleads people into buying dangerous drugs

B. reminds people of a cheerful feeling

C. boasts of the effectiveness of a drug

D. comes from a religious term

GK型空气制动机因采用GK型（）而得名。

A.空气压缩机

B.制动支管

C.副风缸

D.三通阀