In the early nineteenth century, people did not use stamps. They had to pay postage (邮费) when they received letters. Sometimes they didn't want to receive a letter at all, but they had to pay money for it. They were unhappy about this. The postage was high at that time, because the post offices had to send many people to get the postage.
Rowland Hill was a school teacher in England. He was the first to think of using stamps in 1850s. He thought it would be much easier for people to use stamps. People could go to the post office to buy stamps and put them on envelopes before they sent the letters. The post office could just put seals (邮戳). on the stamps so that people could not use the stamps again. In this way, the post office did not need to send post men to get postage. It only needed fewer postmen to send letters.
People began to use stamps ______.
A.at the beginning of the nineteenth century
B.in the middle of the nineteenth century
C.more than two hundred years ago
D.when people first sent letters and postcards.
第1题
A.口服大剂量也不出现胃肠道反应
B.与50S亚基结合,抑制蛋白质合成
C.无味红霉素耐酸、无味,适于儿童服用
D.主要用于耐青霉素的金黄色葡萄球菌感染和青霉素过敏者
E.对革兰阳性菌有强大抗菌作用,对多数革兰阴性菌不敏感
第2题
A.对革兰阳性菌有强大抗菌作用,对革兰阴性菌不敏感
B.与5OS亚基结合,抑制蛋白质合成,发挥抑菌作用
C.无味红霉素耐酸、无味,适于儿童服用
D.主要用于耐青霉素的金黄色葡萄球菌感染和青霉素过敏者
E.乙琥红霉素可引起肝损害
第3题
A.对革兰阳性菌有强大抗菌作用,对革兰阴性菌不敏感
B.与30s 亚基结合,抑制细菌蛋白质合成
C.抗菌效力不及青霉素
D.主要用于耐青霉素的金黄色葡萄球菌感染和青霉素过敏者
E.口服大剂量也不出现胃肠道反应
第4题
A.抗菌谱较窄
B.对多数革兰阳性菌、厌氧球菌抗菌作用强
C.对多数革兰阴性菌作用强
D.对军团菌、支原体、衣原体抗菌作用强
E.与敏感菌核糖体50S亚基结合,抑制蛋白质合成
第5题
A、抗菌谱较窄
B、对多数革兰阳性菌、厌氧菌抗菌作用强
C、对多数革兰阴性菌作用强
D、对军团菌、支原体、衣原体抗菌作用强
E、与敏感菌50S核糖体亚基结合,抑制蛋白质合成
第8题
A.对革兰阳性菌有强大抗菌作用,对大多数革兰阴性菌不敏感
B.破坏DNA回旋酶发挥杀菌作用,不宜用于儿童感染性疾病
C.可用于各系统的感染尤其是泌尿生殖道感染
D.存在中枢毒性和过敏反应
第9题
A.对绿脓杆菌有强大的抗菌作用
B.对革兰阴性球菌、革兰阳性菌、真菌无抗菌作用
C.能杀灭静止期和繁殖期的细菌
D.对革兰阳性菌、革兰阴性球菌有抗菌作用
E.属于慢效杀菌药
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