问题 单项选择题 B1型题

急性胆囊炎常见致病菌是()

A.梭状芽孢杆菌

B.金黄色葡萄球菌

C.溶血性链球菌

D.铜绿假单胞菌

E.大肠埃希菌

答案

参考答案:E

解析:1题:人体的各种感染往往由特定的致病细菌所致。也就是不同的细菌感染可形成相应的感染性疾病,当然也可形成混合性感染。痈是常见的皮肤细菌性感染,由皮肤不洁引起,病原菌常见的是金黄色葡萄球菌。2题:丹毒是皮肤的淋巴管感染,病原菌由皮肤破口进入皮肤淋巴管,引发局部红、肿、热、痛,主要由B型溶血性链球菌所致。3题:破伤风是毒血症,毒素来自伤口中感染的梭状芽孢杆菌,该菌产生的外毒素毒性极强。4题:胆道系统包括胆囊发生感染,感染细菌来自肠道,肠道中细菌种类很多,而胆囊发炎其主要病原菌是肠道的大肠埃希菌。

阅读理解

阅读理解。

     The Internet is a big place. Nobody has the time to look at every webpage to find something. Search

engines (搜索引擎) like Yahoo give us a lot of help.

     Two Stanford University students, David Filo and Jerry Yang started it in 1994. They made a list of

their favorite webpages. When their list got bigger, they made a database (数据库) to keep all the

information. They let everyone use it for free. Soon, thousands of people were using it.

     They then made a new kind of software (软件). It looked at web pages all over the Internet. It could

then take that information and arrange it for someone to look at. If you look for "animals", the engine will

give you a list of web pages with those words.

      Yahoo became a public (公共的,公开的) company in 1996. Filo and Yang, still young men, became

rich. As the company grew, they went on working hard. They improved the software. They also put

more uses in, like shopping, free E-mail, booking tickets and so on. They started Yahoo in many different

countries and languages.    

     Yahoo. Com is famous on the Internet. And unlike most other web companies, Yahoo really makes

money.

1. When Yang and Filo wrote the first Yahoo software, they _____. [ ]

A. made people to use it

B. were still university students

C. knew it wasn't useful

D. were high school students

2. After Yang and Filo became rich, they _____.[ ]

A. became lazy

B. worked less

C. kept working hard

D. stopped working at Yahoo

3. What Yahoo services (服务) are not mentioned in the passage? [ ]

A. Buying and selling stocks.

B. Search engine.

C. E-mail.

D. Booking tickets.

4. Which of the following is true? [ ]

A. Yahoo was always a big company.

B. Yahoo is a private company.

C. Yahoo does not make people pay for their E-mail service.

D. Yahoo is losing money.

5. What does the passage think of most Internet companies? [ ]

A. They don't earn much money.

B. They are all famous.

C. They are just like Yahoo.

D. They are all in English.

单项选择题 配伍题