彩色多普勒超声显像的仪器调节正确，但血管内彩色信号缺失，主要

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问题单项选择题

彩色多普勒超声显像的仪器调节正确，但血管内彩色信号缺失，主要原因是（）

A.血管与声束成0°

B.血管与声束成60°

C.血管与声束成90°

D.血管与声束成120°

E.血管与声束成180°

答案

参考答案：C

阅读理解

根据短文内容，判断正(T)误(F)。

This is a picture of Mr. Green's family. Look, Mr. Green is sitting in a chair. Heis reading a book.

Mrs. Green is at the desk. She is writing to her friend. Their son, Jim, is thirteen. He is standing by the

window. He is reading a storybook. Theirdaughter, Lucy, is only five. She is sitting on the floor. She is

playing with hertoys. What's that behind Lucy? It's a cat. Its name is Mimi. It is playing with aball.

( ) 1. There are five people in Mr. Green's family.

( ) 2. Mr. Green is reading in a chair.

( ) 3. Mrs. Green is writing at the desk.

( ) 4. Lucy is Jim's sister. She is five.

( ) 5. Lucy is playing with the cat.

选择题

“紫禁城内各宫殿，尽为寇兵分国占据。三海、万寿山、颐和园等处各宫中累代珍异皆为日人捆载以去。”这是列强在哪一次侵华战争中犯下的罪行[ ]

A．第二次鸦片战争

B．甲午中日战争

C．八国联军侵华战争

D．日本全面侵华战争