男性，48岁。1年前无明显诱因逐渐出现颈后酸痛不适，双手麻木，不灵活，使用筷子困难。行走时有踩棉花感，易跌倒。查体：前臂外侧痛觉减退，四肢肌张力增高，双Hoffmann试验（+），踝阵挛（+），Babinski（+）。X线检查：颈5～6生理曲度消失，局部轻度后凸畸形，间隙狭窄，增生硬化，椎管矢状径15mm。根据患者症状、体征，临床可初步诊断为（）
A.神经根型颈椎病
B.肌萎缩型侧索硬化症
C.脊髓型颈椎病
D.脊髓空洞症
E.胸廓出口综合征
参考答案：C
Imagine the situation. You are driving along a desert or on a mountain. You have no idea where you are. You passed the last house two hours ago. Then your car breaks down. 小题1: You have no mobile phone. What should you do? Well, next time take a GPS with you. This invention may be able to help you. 小题2: It can find your position to within 20 metres. A GPS cannot start your car, but at least you will know where you are.
GPS, which means Global Positioning System, is a small radio receiver. It looks like a mobile phone. 小题3: We also find GPS devices in cars, planes, or boats. Some of these devices have electronic maps, so you know where you are. 小题4:
Some people think that in the future the GPS will be as common as the mobile. 小题5: here are also new uses for the GPS. Perhaps they will become like watches. Everyone will have one and you will never be lost again.
| A:It is a device(装置) which uses satellites to find the user’s position. B: For example, in a city they can tell you the name of the street. C:It is night and it is cold. D: There are three parts to the Global Positioning System. E: You can hold it in your hand, or put in your pocket. F:They are becoming cheaper and more and more accurate(精确的). |