问题 多项选择题

氨苄西林具有以下特点()

A.对A组溶血性链球菌、B组溶血性链球菌、肺炎球菌、青霉素敏感金葡菌有较强活性,但不如青霉素

B.对肠球菌和利斯特菌的作用优于青霉素,对草绿色链球菌具有良好抗菌作用

C.对β-内酰胺酶稳定

D.医院内分离的革兰阴性杆菌如大肠杆菌、铜绿假单胞菌、肠杆菌常耐药

E.常用于流感嗜血杆菌、脑膜炎球菌、肺炎球菌、链球菌等所致儿童

答案

参考答案:A, B, D, E

问答题 简答题
单项选择题

Come on—Everybody’s doing it. That whispered message, half invitation and half forcing, is what most of us think of when we hear the words peer pressure. It usually leads to no good—drinking, drugs and casual sex. But in her new book Join the Club, Tina Rosenberg contends that peer pressure can also be a positive force through what she calls the social cure, in which organizations and officials use the power of group dynamics to help individuals improve their lives and possibly the word.

Rosenberg, the recipient of a Pulitzer Prize, offers a host of examples of the social cure in action: In South Carolina, a state-sponsored antismoking program called Rage Against the Haze sets out to make cigarettes uncool. In South Africa, an HIV-prevention initiative known as LoveLife recruits young people to promote safe sex among their peers.

The idea seems promising, and Rosenberg is a perceptive observer. Her critique of the lameness of many pubic-health campaigns is spot-on: they fail to mobilize peer pressure for healthy habits, and they demonstrate a seriously flawed understanding of psychology. "Dare to be different, please don’t smoke!" pleads one billboard campaign aimed at reducing smoking among teenagers teenagers, who desire nothing more than fitting in. Rosenberg argues convincingly that public-health advocates ought to take a page from advertisers, so skilled at applying peer pressure.

But on the general effectiveness of the social cure, Rosenberg is less persuasive. Join the Club is filled with too much irrelevant detail and not enough exploration of the social and biological factors that make peer pressure so powerful. The most glaring flaw of the social cure as it’s presented here is that it doesn’t work very well for very long. Rage Against the Haze failed once state funding was cut. Evidence that the LoveLife program produces lasting changes is limited and mixed.

There’s no doubt that our peer groups exert enormous influence on our behavior. An emerging body of research shows that positive health habits—as well as negative ones—spread through networks of friends via social communication. This is a subtle form of peer pressure: we unconsciously imitate the behavior we see every day.

Far less certain, however, is how successfully experts and bureaucrats can select our peer groups and steer their activities in virtuous directions. It’s like the teacher who breaks up the troublemakers in the back row by pairing them with better-behaved classmates. The tactic never really works. And that’s the problem with a social cure engineered from the outside: in the real world, as in school, we insist on choosing our own friends.

According to the first paragraph, peer pressure often emerges as()

A. a supplement to the social cure

B. a stimulus to group dynamics

C. an obstacle to school progress

D. a cause of undesirable behaviors