问题 单项选择题

诊断慢性粒细胞白血病急性变的最主要的依据是

A.不明原因的发热及贫血加重

B.外周血幼稚细胞较以前增多

C.Ph染色体阳性

D.脾脏迅速增大

E.骨髓中原始细胞≥20%

答案

参考答案:E

解析:慢粒急变期的标准:骨髓或外周血原始细胞≥20%;或原始加早幼粒细胞,外周血达30%,骨髓达50%;或出现髓外原始细胞浸润。

问答题 案例分析题
阅读理解

阅读理解。

     If you wish to become a better reader, here are four important points to remember about rate, or speed,

of reading:

     1. Knowing why you are reading-what you are reading to find out-will often help you to know whether

to read rapidly or slowly.

     2. Some things should be read slowly throughout. Examples are directions for making or doing something,

arithmetic problems, science and history books, which are full of important information. You must read such

things slowly to remember each important step and understand each important idea.

     3. Some things should be read rapidly throughout. Examples are simple stories meant for enjoyment, news,

and letters from friends, items, or bits of news from local, or hometown, paper, telling what is happening to

friends and neighbors.

     4. In some of your readings, you must change your speed from fast to slow to fast, as you go along. You

need to read certain pages rapidly and then slow down and do more careful readings when you come to

important ideas which must be remembered.

1. According to the passage, your reading speed depends on _____. [ ]

A. whether the reading material is easy or difficult

B. what you are reading

C. what your purpose in reading something is

D. both B and C 

2. If one wants to be relaxed by reading, one should take up _____. [ ]

A. a story book

B. a book on science and technology

C. news, letters from friends

D. some material full of information 

3. Which of the following readings should you read slowly and carefully?[ ]

A. Fairy tales.

B. Aesop's Fables.

C. Directions for use of a machine

D. An evening paper. 

4. Which of the following can best express the main idea of the passage? [ ]

A. How to decide your reading speed.

B. How to raise your reading speed.

C. How to improve your reading skills.

D. How to choose your reading materials.