某男，53岁。头晕、乏力、四肢麻木、站立和行走不稳半年余就诊。8年前曾因胃出血行全胃切除术。化验：RBC2．1×10／L，Hb72g,／L，WBC3．2×10／L，血小板86×10／L，MCV140fl(140μm)，MCH42pg，血清维生素B浓度86pg／ml(正常值200～900pg／ml)，叶酸正常。

本例拟诊为维生素B缺乏性贫血，其最可能的原因是

A:维生素B摄入不足 B:慢性腹泻致维生素B吸收减少 C:内因子缺乏症 D:合并节段性回肠炎(克罗恩病) E:肠道寄生虫感染

某男性患者，缺失，余留牙正常，进行可摘局部义齿修复，基牙设计弯制卡环

上若设计铸造支托，那么支托的颊舌径宽度约为颊舌径的

A:1／4 B:1／3 C:1／2 D:2／3 E:3／4

某男性患者，41岁，缺失，余留牙无异常，咬合关系良好，要求做非贵金属烤瓷桥修复，比色A3

制作3个单位下列PFM桥金属基底宜采用

A:整体铸造法 B:分段铸造炉内前焊法 C:分段铸造炉内后焊法 D:分段铸造激光熔接法 E:以上均可

某男性患者，59岁，缺失，余留牙正常。要求做整铸支架，设计对半卡环，用前腭杆，后腭杆和侧腭杆连接

侧腭杆位于上颌硬区的一侧或两侧，杆宽度4～5mm，厚度约

A:0．6mm B:0．8mm C:1．0mm D:1．2mm E:1．4mm

某男性患者，28岁，近中倾斜阻生，远中颈部可疑龋坏。现拟拔除

若患者拔牙后4天出现发热、开口困难、吞咽疼痛，拔牙窝黏膜红肿压痛，最可能的诊断是

A:干槽症 B:拔牙术后正常反应 C:牙槽脓肿 D:咽前间隙感染 E:牙槽骨创伤

某男性患者，41岁，缺失，余留牙无异常，咬合关系良好，要求做非贵金属烤瓷桥修复，比色A3

制作3个单位以下PFM桥金属基底宜采用

A:整体铸造法 B:分段铸造炉内前焊法 C:分段铸造炉内后焊法 D:分段铸造激光熔接法 E:以上均可

某男性患者，63岁，9个月前因喉癌（TNM）行全喉切除+右侧功能性颈清扫术，术后有咽瘘发生，经换药1个月后愈合，之后行放疗。现右侧颈部胸锁乳突肌前缘处皮肤溃烂、红肿、隆起、疼痛。

胸大肌肌皮瓣修补后3小时，发现患者移植的皮瓣苍白、温度低，哪些是可能的原因

A:供血动脉痉挛引起 B:回流静脉栓塞引起 C:供血动脉栓塞引起 D:皮瓣设计不足，缝合张力过大 E:血管蒂扭曲、折叠引起 F:受区止血不当，肌皮瓣下有血肿引起

Across the Deserts

　　The SaharaDesertis the largest desert in the world. It stretches across Africa fromSenegaltoEgypt. TheSaharaDesertis an unfriendly environment. During the day it"s very hot, and at night it’s sometimes very cold. It is also difficult to find water in theSahara.

　　In 2006, Kevin Lin, Ray Zahab, and Charlie Engle decided to do something very difficult. They made the decision to run across the Sahara Desert 4,300 miles (6,920km). It seemed impossible to do, but they wanted to try. The three men liked to test themselves, and this would be a very big test.

　　On the morning of November 2, Kevin, Ray, and Charlie started their trip across theSahara. Every morning they began running at 5:00. At11 a.m. they stopped and rested until 5 p.m. Then they ran again until 9:30 in the evening. Each day they ran about 40 miles (64 km). Every day it was the same thing. They got up and ran. They listened to music on their iPods, and they ran and ran.

　　Kevin, Ray, and Charlie needed to eat a lot of food during their trip. Most people need about 2,000 calories of food each day. Kevin, Ray, and Charlie needed between 6,000 and 9,000 calories every day. That"s a lot of food! They also needed to drink a lot of water.

　　The three men had some problems on their trip, and many times they wanted to quit and go home. It was often very hot (140°F/60°C) during the day, and the heat made them sick. Their legs and feet hurt. Sometimes it was very windy, and they couldn"t see. One time they got lost. But they didn"t quit. After 111 days, Kevin, Ray; and Charlie successfully finished their trip across theSaharaDesert. They hugged each other and put their hands in the water of theRed Sea. Then they ran to a hotel to take a long shower.

　　词汇：

　　Stretch / strɛtʃ / v. 延伸，伸展

　　Calorie / "kælərɪ / n. 卡(路里)，小卡，大卡

　　Quit / kwɪt / v. 停止，放

　　注释：

Each day the men ran for approximately eight hours.

A:Right B:Wrong C:mentioned

Across the Deserts

　　The SaharaDesertis the largest desert in the world. It stretches across Africa fromSenegaltoEgypt. TheSaharaDesertis an unfriendly environment. During the day it"s very hot, and at night it’s sometimes very cold. It is also difficult to find water in theSahara.

　　In 2006, Kevin Lin, Ray Zahab, and Charlie Engle decided to do something very difficult. They made the decision to run across the Sahara Desert 4,300 miles (6,920km). It seemed impossible to do, but they wanted to try. The three men liked to test themselves, and this would be a very big test.

　　On the morning of November 2, Kevin, Ray, and Charlie started their trip across theSahara. Every morning they began running at 5:00. At11 a.m. they stopped and rested until 5 p.m. Then they ran again until 9:30 in the evening. Each day they ran about 40 miles (64 km). Every day it was the same thing. They got up and ran. They listened to music on their iPods, and they ran and ran.

　　Kevin, Ray, and Charlie needed to eat a lot of food during their trip. Most people need about 2,000 calories of food each day. Kevin, Ray, and Charlie needed between 6,000 and 9,000 calories every day. That"s a lot of food! They also needed to drink a lot of water.

　　The three men had some problems on their trip, and many times they wanted to quit and go home. It was often very hot (140°F/60°C) during the day, and the heat made them sick. Their legs and feet hurt. Sometimes it was very windy, and they couldn"t see. One time they got lost. But they didn"t quit. After 111 days, Kevin, Ray; and Charlie successfully finished their trip across theSaharaDesert. They hugged each other and put their hands in the water of theRed Sea. Then they ran to a hotel to take a long shower.

　　词汇：

　　Stretch / strɛtʃ / v. 延伸，伸展

　　Calorie / "kælərɪ / n. 卡(路里)，小卡，大卡

　　Quit / kwɪt / v. 停止，放

　　注释：

In the middle of the day: the men usually stopped running.

A:Right B:Wrong C:mentioned

Across the Deserts

　　The SaharaDesertis the largest desert in the world. It stretches across Africa fromSenegaltoEgypt. TheSaharaDesertis an unfriendly environment. During the day it"s very hot, and at night it’s sometimes very cold. It is also difficult to find water in theSahara.

　　In 2006, Kevin Lin, Ray Zahab, and Charlie Engle decided to do something very difficult. They made the decision to run across the Sahara Desert 4,300 miles (6,920km). It seemed impossible to do, but they wanted to try. The three men liked to test themselves, and this would be a very big test.

　　On the morning of November 2, Kevin, Ray, and Charlie started their trip across theSahara. Every morning they began running at 5:00. At11 a.m. they stopped and rested until 5 p.m. Then they ran again until 9:30 in the evening. Each day they ran about 40 miles (64 km). Every day it was the same thing. They got up and ran. They listened to music on their iPods, and they ran and ran.

　　Kevin, Ray, and Charlie needed to eat a lot of food during their trip. Most people need about 2,000 calories of food each day. Kevin, Ray, and Charlie needed between 6,000 and 9,000 calories every day. That"s a lot of food! They also needed to drink a lot of water.

　　The three men had some problems on their trip, and many times they wanted to quit and go home. It was often very hot (140°F/60°C) during the day, and the heat made them sick. Their legs and feet hurt. Sometimes it was very windy, and they couldn"t see. One time they got lost. But they didn"t quit. After 111 days, Kevin, Ray; and Charlie successfully finished their trip across theSaharaDesert. They hugged each other and put their hands in the water of theRed Sea. Then they ran to a hotel to take a long shower.

　　词汇：

　　Stretch / strɛtʃ / v. 延伸，伸展

　　Calorie / "kælərɪ / n. 卡(路里)，小卡，大卡

　　Quit / kwɪt / v. 停止，放

　　注释：

They sometimes felt sick because it was so hot.

A:Right B:Wrong C:mentioned