患者，男，20岁。因两手麻木、乏力伴多次手烫伤2年来诊。神经系_爱下问搜题

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问题单项选择题 A1/A2型题

患者，男，20岁。因两手麻木、乏力伴多次手烫伤2年来诊。神经系统检查：两上肢及肩部疼痛觉显著减退，触觉及音叉振动觉正常；两手握拳肌力Ⅳ度，左侧巴氏征（±）。该患者首先需要的辅助检查是（）

A.维生素B₁₂浓度测定

B.头颅CT检查

C.颈髓磁共振检查

D.腰穿检查脑脊液

E.椎管内造影

答案

参考答案：C

解析：患者为青年男性，病程已2年，表现为两手的运动和浅感觉受损，尤其是两手多次反复烫伤史，应首先考虑脊髓空洞症的可能，因为临床上脊髓空洞症多数为先天性因素引起，发病年龄偏小，有些空洞随着年龄增大而逐渐扩大，除影响脊髓中央浅感觉交叉纤维外，尚可引起脊髓内其他神经通路等结构的损害，造成相应的功能障碍，而空洞的部位多好发于颈髓，其次在延髓，也可见于其他脊髓节段。磁共振成像对空洞的检出率很高，应首选颈髓磁共振检查。

完形填空

It was already late when we set out for the next town,       according to the map was about fifteen miles away on the other side of the
There we felt     that we would find a bed     the night. Darkness fell soon after we left the village, but luckily we met       as we drove fast along the narrow winding road that       the hills. As we climbed      , it became colder and rain began to fall,       it difficult at times to see the road. I asked John, my companion, to drive more      .
After we had traveled for about twenty miles, there was still no sign of the town which was    on the map. We were beginning to get     . Then without warning the car stopped. A quick    showed that we had run out of petrol. Although we had little food with us, we decided to      the night in the car.
Our meal was soon over. I tried to go to sleep at once,    John, who was a     sleeper, got out of the car after a few minutes and went for a walk       the hills. Soon he came back. From the top of the hill he had seen, in the valley below, the      of the town we were looking for. We at once unloaded all our luggage and with a great effort,    to push the car to the top of the hill. Then we went back to the luggage, loaded the car again and set off down the hill.   less than a quarter of an hour we were in the town, where we found a         quite easily.

D．belonged to

C．examination

D．information

选择题

W、X、Y、Z是原子序数依次增大的四种短周期元素，化合物WX能抑制水的电离。化合物Y₂Z能促进水的电离，则Y元素是

A．Na

B．F

C．Li

D．Cl