问题
单项选择题 B型题
正常胸膜-肺、软组织-骨骼界面呈（）。
A.强回声
B.高回声
C.等回声
D.低回声
E.无回声
答案
参考答案：A
解析：此题为记忆题，正常人体不同组织回声强度存在较大差异，这需要超声医师熟记。另外，脂肪属于疏松结缔组织，但由于其中胶原纤维含量和血管成分多少的不同，不同部位的脂肪组织可有很大的差别。
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正常胸膜-肺、软组织-骨骼界面呈（）。
A.强回声
B.高回声
C.等回声
D.低回声
E.无回声
参考答案：A
解析：此题为记忆题，正常人体不同组织回声强度存在较大差异，这需要超声医师熟记。另外，脂肪属于疏松结缔组织，但由于其中胶原纤维含量和血管成分多少的不同，不同部位的脂肪组织可有很大的差别。
In Britain, people have different attitudes to the police. Most people generally ____them and the job they do，although there are certain people who do not believe that the police____have the power that they do. What does a policeman actually do? It is not ____job to describe. After all, a policeman has a number of jobs in ____.A policeman often has to control traffic, either____ foot in the centre of a town, or in a police car on the roads. Indeed, in Britain, he might be in the Traffic Police and spend all, or a lot of, his time ____up and down main roads and motorways. A traffic policeman has to help keep the traffic moving, stop ____motorists and help when there is an accident. A policeman has to help keep the ___， too. If there is a fight or some other disturbance, we ___ the police to come and restore order. And they often have to ____ situation at great risk to their own ____.We expect the police to solve crimes, of course, so an ordinary policeman, ____ he is not a detective(侦探)，will often have to help___and arrest criminals. And ___ do we call when there is an emergency—an air crash, a____，a road accident, or a robbery? We call the police.___a policeman has to be ____to face any unpleasant emergency that may happen in the ___ world. The police do an absolutely necessary job, they do it ____ well and I support them, but I do not envy policemen. I do not think that I could____do the job of a policeman.
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