问题 单项选择题

彩色多普勒技术和超声负荷试验并用可以()

A、减少彩色噪声 

B、增加速度测量范围 

C、使血流速度增快,血流量增大,增加彩色多普勒的敏感性 

D、提高彩色帧频 

E、以上都正确

答案

参考答案:E

单项选择题 A1型题
阅读理解

Mrs. Janes gave music lessons at a school. She had a good voice and enjoyed singing, except that some of her high tones sound like a gate that had forgotten to oil. Mrs. Janes knew her weakness well, and took every chance she could find to practise these high notes. As she lived in a small house, where she could not practise without disturbing the rest of the family, she usually went for long walks along the country roads whenever she had time and practised her high notes there. Whenever she heard a car or a person coming along the road, she stopped and waited until she could no longer be heard before she started practicing again, because she was a shy person.

One afternoon, a fast, opened car came up behind her so silently and so fast that she didn’t hear it until it was only a few yards from her. She was singing some of her highest and most difficult tones at that time and as the car passed; she saw an anxious expression came over the driver’s face. He stopped his car suddenly, jumped out and began to examine all his tyres carefully.

Mrs. Janes didn’t dare to tell him what the noise he had heard really was, so he got back into the car and drove off.

小题1: How did Mrs. Janes sing?

A.She sang well, but she didn’t practise singing hard.

B.She enjoyed singing, but she had a terrible voice.

C.She was a good singer, but she could not sing the high tones well.

D.She sang terribly, she was no singer at all.小题2:Why did she go for long walks along the country roads?

A.Because she enjoyed the country’s fresh air.

B.Because she was afraid to disturb the rest of the family.

C.Because she lived in a small house far away.

D.Because she was afraid to practise the high tones.小题3: Why did the driver stop his car suddenly and jump out of it?

A.Because he supposed something must have gone wrong with his car.

B.Because he was moved by the pretty voice of Mrs. Janes.

C.Because he wondered what had happened to Mrs. Janes.

D.Because he frightened by the terrible voice of Mrs. Janes.小题4: Where did the noise come from?

A.From the small house.

B.From Mrs. Janes’ voice.

C.From the types.

D.From the engine.