患者，男性，63岁，前列腺癌手术后，因肿瘤已转移至骨，正接受放射治疗，现已出现晚期癌痛症状，特别当患者坐时，感觉右髋疼痛加重，运动时后背疼痛加剧。该患者每日口服氧可酮+对乙酰氨基酚用于止痛，但疼痛日益加重。
若患者需继续服用镇痛药缓解癌症疼痛，最好选用下列哪一种药（）
A.布托啡诺
B.可待因+阿司匹林
C.美沙酮
D.喷他佐辛
E.右丙氧芬
参考答案：C
| 完形填空。 | |||
| Nur Memet,a 53-year-old farmer,left his home in Shule County of Xinjiang early Saturday morning. With seven young trees on his bicycle,he joined a one-kilome-ter line of people 1 trees in his village. 2 the days when his grandpa's grandpa was alive,his family has been planting trees every spring. He has continued this tradition(传统) 3 over 30 years. His family is not 4 only one in Shule County with a tree-planting tradition, Shule County,which is near the Taklimakan Desert,gets 5 rainfall(降雨) per year. Each spring when the wind blows, Shule County has has "dust fall" 6 rainfall,with dust floating in the air. In order to fight the wind, the people 7 there have a long history of planting trees. They plant as many trees as they 8 for at least four or five days every March. Nur's house is now 9 by more than 400 trees.Though the road to the house is only three-meter 10 ,trees along the sides of the road are as tall as 20 meters. "When I was even shorter than a sheep,my mother told me again and again we should plant trees every year, " Nur said. | |||
| ( )1. A. planting ( )2. A. Because ( )3. A. for ( )4. A. a ( )5. A. many ( )6. A. next to ( )7. A. visiting ( )8. A. can ( )9. A. damaged ( )10. A. tall | B. cutting B. So B. in B. an B. few B. because of B. living B. must B. surrounded B. high | C. buying C. Since C.during C. / C. little C. nothing but C. moving C. may C. filled C. wide | D. selling D. However D. on D. the D. much D. instead of D. traveling D. need D. broken D. deep |