问题 单项选择题

99mTc标记硫胶体消化道出血显像描述错误的是()

A.静脉注射的99mTc硫胶体被肝脏、脾脏和骨髓中的单核巨噬系统细胞迅速清除

B.注射后15分钟,绝大部分的放射性胶体已从血液中清除

C.活动性消化道出血时,放射性胶体通过出血部位进入肠道并随肠内容物移行

D.注射后30分钟,绝大部分的放射性胶体已从血液中清除

E.血本底快速被清除后,在出血点可以得到很高的靶/本底比值,从而清晰显示出血部位

答案

参考答案:D

解析:99mTc标记硫胶体注射后15分钟,绝大部分的放射性胶体已从血液中清除。

阅读理解

阅读理解。

     Booker T. Washington was born in a black slave family in Virginia of the USA in 1856, seven years

before slavery was abolished (废除) by Abraham Lincoln in January, 1863.

     He wrote a book about his life called Up From Slavery, which was published in 1901. In the book,

he said that he had no choice but to work in a coal mine when he was 16 years old. He had no chance to

go to school. He heard two coal miners talking about a school for black children which was called the

Hampton Institute.

     He determined that he would go there. He gave up his job and told other members of his race that he

was going to school across the state. The older people had spent their best years as slaves and were poor. However, some gave Booker some pocket money or a handkerchief. Hardly had anyone expected any

of their race to leave home to attend a boarding school. He took a train to Richmond, Virginia, where he

ran out of money. It was 82 miles from the Hampton Institute. He slept under a wooden sidewalk(人行道).            

     He helped unload pigs and iron from a ship for some money and when he had enough, he continued

his journey, arriving at school with 50 cents.

     This diligence(勤奋) pushed him to graduate and become a teacher at the Hampton Institute. When

he was 25 years old, he was asked to start a new school for black children in Alabama. called the

Tuskegee Normal and Industrial Institute. Thirty-four years later, this school had 1,500 students and 200

teachers and Booker T. Washington became the most influential black leader of his generation.

1. What's the purpose of the passage?

A. To show the significance of education for black children.

B. To introduce Booker T. Washington's working experience as a slave.

C. To present a brief introduction of Booker T. Washington.

D. To explain the reason why Booker T. Washington becomes a writer.

2. Booker T. Washington didn't go to school early in life because ________.

A. there were no schools for slave in America.

B. blacks were not allowed to receive education.

C. he had to work as a coal miner.

D. he was not smart enough to receive education.

3. The older people didn't give Booker much money because _________.

A. they had no jobs to do.

B. they didn't have much money.

C. they didn't believe Booker would succeed.

D. they didn't wish Booker to go to school.

单项选择题