2岁男孩，生后即发现有青紫现象，久站喜蹲踞，心脏听诊可在胸骨左缘第2肋间闻及Ⅱ级喷射

发展先进制造业、提高服务业比重和加强基础产业基础设施建设，是产业结构调整的重要任务，下列说法有误的是（）。

A.要以自主创新提升产业技术水平

B.加强发展先进制造业

C.促进服务业加快发展

D.促进城镇化健康发展

比较风湿性心内膜炎与亚急性细菌性心内膜炎时瓣膜赘生物的形态和后果。

为防止轨道电路人工短路或绝缘破损引起的错误解锁采用了（）。

A、FDGJ

B、三点检查法

C、向12、13线供电

D、KZ-GDJ四条件电源

资本主义生产关系最初萌芽于______

A．西欧封建社会初期
B．亚洲封建社会中期
C．东欧封建社会末期
D．西欧封建社会末期

In the absence of optimism, we are left with nothing but critics, naysayers, and prophets of doom. When a nation expects the worst from its people and institutions, and its experts focus exclusively on faults, hope dies. Too many people spend too much tie looking down rather than up, finding fault with their country’s political institutions, economic system, educational establishment, religious organizations, and—worst of all—with each other.

Faultfinding expends so much negative energy that nothing is left over for positive action. It takes courage and strength to solve the genuine problems that afflict every society. Sure, there well always be things that need fixing. But the question is, do you want to spend your time and energy tearing things down or building them up

The staging of a Broadway show could illustrate my point. Let’s say a new production is about to open. A playwright has polished the script, investor have put up the money, and the theater has been rented. A director has been chosen, actors have been auditioned and selected, and the cast has been rehearsing for weeks. Set, lighting, and sound engineers have been hard at work. By the time opening night arrives, nearly a hundred people have labored tirelessly—all working long hours to make magic for their audience.

On opening night, four or five critics sit in the audience. If they pan it, the play will probably close in a matter of days or weeks. If they praise it, the production could go on for a long and successful run. In the end, success or failure might hinge on the opinion of a single person—someone who might be in a bad mood on opening night! What’s wrong with this scene In one sense, nothing. Critics have a legitimate role. The problem arises when we make critics our heroes or put them in control of our fate. When we empower the critic more than the playwright, something is wrong. It is much easier to criticize than to create. When we revere the critics of society, we eventually become a society of critics, and when that happens, there is no room left for constructive optimism.

Compared with the playwrights, the critics are, according to the author, ().

A. pretentious rather than honest

B. arrogant rather than modest

C. cruel rather than merciful

D. destructive rather than constructive