问题 单项选择题

对铜绿假单胞菌活性良好的药物()。

A.甲氧苄啶

B.环丙沙星

C.磺胺嘧啶

D.呋喃唑酮

E.萘啶酸

答案

参考答案:B

解析:考查重点是抗菌药物的应用。甲氧苄啶为抗菌增效剂,可增强磺胺类药的抗菌作用;呋喃唑酮口服吸收少,肠内浓度高对革兰阳性及阴性菌菌有一定抗菌作用。临床主要用于细菌性痢疾等肠道感染;萘啶酸为最早应用的喹诺酮类,对铜绿假单胞菌无效;环丙沙星为合成的第三代喹诺酮类抗菌药物,具广谱抗菌活性,杀菌效果好,几乎对所有细菌的抗菌活性均较诺氟沙星及依诺沙星强2~4倍,对肠杆菌、绿脓杆菌、流感嗜血杆菌、淋球菌、链球菌、军团菌、金黄色葡萄球菌具有抗菌作用,环丙沙星对铜绿假单胞菌活性良好。

名词解释
单项选择题

A total of 4.6 million digital televisions have been sold, and the sales of HDTV sets have quadrupled since last year. Consumers have bought HDTVs to play their DVDs and to have clearer pictures and wide screens. Only a small percentage of the people who have purchased HDTVs, however, have actually ^hooked their TVs up# to receive high-definition television digital signals. Perhaps television viewers are having trouble keeping up with the changes in technology. Even the manufacturers of HDTVs, like Mitsubishi, Thomson Multimedia, Sony, and Samsung seem to have a tough time learning how to make their sets work with the various digital TV formats because little standardization has been required or implemented in the industry.Some of the HDTVs weigh over 200 lbs., and a variety of retailers offer a delivery service to the buyer’’s home to help install the heavy sets. This is known as a white-glove service and usually comes with an extra fee. After HDTV purchasers get their sets home and hook them up, they will still need to work to get the digital signals to their systems. Most of the industry’’s cable providers do not yet offer high-definition programing, and only about 15% of commercial television stations have switched over to even the lowest improved digital pictures. Worse yet, viewers may need to install antenna before they can even get the digital signals to their new HDTV sets. Another frustration for home-theater seekers is that the current HDTV sets allow owners only to watch high-definition programs, not to record them.

On the whole, this passage is positioned to dwell on________.

A.the overall picture of the HDTV sector

B.how the giant TV makers should offer better products

C.a lament over consumers’ inability to use a high-end TV set

D.a criticism of the TV makers for doing nothing about a big problem