问题 单项选择题 B型题

氨基苷类中可用于治疗结核病的是()

A.链霉素

B.庆大霉素

C.多黏菌素

D.奈替米星

E.新霉素

答案

参考答案:A

解析:链霉素对结核分枝杆菌具有抗菌作用,是最早使用的抗结核病药物。庆大霉素是目前应用最广泛的氨基苷类抗生素。新霉素的耳毒性和肾毒性都是氨基苷类抗生素中最大的。

阅读理解

阅读理解。

     John was seven. He lived with his grandparents in the countryside before he came to our class

because his parents had to work in the city. They also had no time to take care of him. So he was a new

student in our class. And he knew nothing about the things that happened in big cities. Now he was

standing in the front of the classroom because Mr. Smith, the teacher, was asking John a lot of questions.

But John couldn't answer any of them. Mr. Smith then decided to ask him some easier questions so that

he could answer a few.

     "What was Thomas Edison?" he asked.

     John thought for some time and then answered in a very low voice, "A singer from America."

     "No. Thomas Edison was a great American inventor," Mr. Smith said. He was getting a little angry

now because everyone knows the great man, but he was trying not to let his students see that. Then he

asked again. "Who was the first president (总统) of the United States?"

     John thought for a long time, but said nothing. Mr. Smith shouted, "George Washington!" John turned

back and began to walk to his seat sadly.

     "Come back!" Mr. Smith shouted. "I didn't tell you to go back!"

     "I'm sorry," John said. "I thought you were calling the next student."

1. John lived with grandparents because ______.

A. his parents were busy working in the city

B. he had no school to go to

C. he loved the class

D. he didn't study hard

2. Thomas Edison was ______.

A. a singer

B. a doctor

C. an inventor

D. the president

3. Why did John answer in a low voice?

A. He knew the question well.

B. The question was easy.

C. He wasn't sure about his answer.

D. He didn't want to answer.

4. How many right answers did John give?

A. One.

B. Two.

C. Three.

D. None.

问答题