问题 多项选择题

MRI应用于心脏大血管成像的优势有哪些().

A.无需任何对比剂即可成像

B.属无创性检查,无放射线辐射损伤,安全性高

C.MRA对冠脉的显示优于CTA和DSA

D.MRI为三维成像,可进行任意平面断层扫描

E.心脏电影可动态显示心脏内结构运动,并可对心功能进行更加全面而准确的评估

答案

参考答案:A, B, D, E

解析:MRI应用于心血管检查的优势在于:①无需任何对比剂即可成像,是由于心肌和血管壁组织与血流的信号存在良好的对比;②属无创性检查,也无放射线辐射损伤,有较高的安全性;③MRI为三维成像,可进行任意平面断层扫描;④MRI心脏电影可动态显示心脏瓣膜运动、血流动力学和心肌收缩率等,并可对心功能进行更加全面而准确的评估。在冠脉显示的图像质量上CTA和DSA优于MRA检查。

判断题
阅读理解

Can you understand the beginning of this essay?

“My smmr hols wr CWOTT. B4, we usd 2go2 NY 2C my bro, his GF & 3 kds FTF.”

The Scottish teacher who received it in class had no idea what the girl who wrote it meant. The essay was written in a form of English used in cell phone text messages. Text messages (also called SMS2) through cell phones became very popular in the late 1990s. At first, mobile phone companies thought that text messaging would be a good way to send messages to customers, but customers quickly began to use the text messaging service to send messages to each other. Teenagers in particular enjoyed using text messaging, and they began to create a new language for messages called texting.

A text message is limited to 160 characters, including letters, spaces, and numbers, so messages must be kept short. In addition, typing on the small keypad of a cell phone is difficult, so it’s common to make words shorter. In texting, a single letter or number can represent a word, like “r” for “are,”“u” for “you,” and “2” for “to.” Several letters can also represent a phrase, like “lol” for “laughing out loud.” Another characteristic of texting is the leaving out of letters in a word, like spelling “please” as “pls.”

Some parents and teachers worry that texting will make children bad spellers and bad writers. The student who wrote the essay at the top of this page said writing that way was more comfortable for her. (The essay said, “My summer holidays were a complete waste of time. Before, we used to go to New York to see my brother, his girlfriend, and their three kids face to face.”)

Not everyone agrees that texting is a bad thing. Some experts say languages always evolve, and this is just another way for English to change. Other people believe texting will disappear soon. New technology for voice messages may soon make text messages a thing of the past.

小题1:What is the writer’s opinion of text messaging?

A.It is fun and easy to do.

B.It is not bad for children.

C.It will make children bad writers.

D.The writer does not give an opinion.小题2:Which characteristic of texting is NOT described in the passage?

A.Using phrases to represent essays

B.Using numbers to represent words

C.Using letters to represent phrases

D.Using letters to represent words小题3:Which of the following was most probably the title of the student’s essay?

A.My Gr8 Tchr

B.CU in LA

C.My GF

D.My Smmr Hols小题4:   Why do some people think that texting is bad?

A.It costs too much.

B.It’s too difficult to type.

C.Children won’t learn to write correctly.

D.It’s not comfortable.小题5:Why aren’t some people worried about the effect of texting?

A.Not many people use texting.

B.Spelling in English is too difficult.

C.Children quickly become bored with texting.

D.Texting will disappear because of new technology.