问题 单项选择题

脉络膜黑色素瘤的超声表现,下列不正确的是()。

A.肿瘤常呈半球形或蘑菇形

B.肿瘤表面有视网膜,故前缘回声连续光滑

C.肿瘤前部回声高而密,向后渐减少减弱,近球壁形成无回声区,即挖空征

D.出现脉络膜凹陷征,可继发视网膜脱离

E.肿瘤内部血流不丰富,频谱多普勒为低速高阻连续性血流

答案

参考答案:E

解析:脉络膜黑色素瘤是成年人最常见的眼内恶性肿瘤,超声特征:半圆形或蘑菇形实性物,边缘光滑锐利,前部回声光点密集明亮,向后逐渐减弱,接近眼球壁出现无回声暗区--挖空现象;肿瘤局部眼球壁较周围正常区回声低下,称脉络膜凹陷;继发视网膜脱离。CDFI示肿瘤内部血流丰富,脉冲多普勒为高速低阻血流频谱。

填空题
阅读理解

Many students in China are learning English. Some of these students are small children. Others are teenagers. Many are adults. Some learn at school, others study by themselves. A few learn English language over the radio, on television, or in films. One must work hard to learn another language.

Why do all these people want to learn English? It is difficult to answer that question. Many boys and girls learn English at school because it is one of their subjects. They study their own language and maths and English ... Some people learn English because it is useful for their work. Many people often learn English for their higher studies, because at college or university some of their books are in English. Other people learn English because they want to read newspaper and magazines in English.

小题1:Many students in China are learning English, aren't they? ____.

A.No, they aren't

B.No, they are

C.Yes, they are

D.Yes, they aren't小题2: If one wants to learn another language well, he must ____.

A.learn at school

B.study by himself

C.work hard

D.study hard小题3: The sentence "It is difficult to answer that question" means ____.

A.that question is not difficult to answer

B.that question is difficult to answer it

C.it is difficultly to answer that question

D.it is hard to answer that question小题4:"Their own language" means ____.

A.Chinese

B.English

C.French

D.Japanese小题5:What's the Chinese of "study by themselves"?

A.和他们一起学习

B.自学

C.向他们学习

D.通过学习