下列镇痛药及其作用与激动脑内阿片受体无关的是（）
A.曲马朵
B.罗通定
C.美沙酮
D.哌替啶
E.芬太尼
参考答案：B
解析：罗通定是罂粟科草本植物延胡索所含延胡索乙素左旋体的有效部分。镇痛效力比解热镇痛药强，其镇痛作用与脑内阿片受体作用无关。对慢性持续性钝痛效果较好。主要用于治疗胃肠及肝胆系统等内科疾病所引起的钝痛，也可用于痛经及分娩止痛，对产程及胎儿均无不良影响。
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| Earthquakes are 1 ; thousands of them happen each day. But most are too weak to feel. During a big earthquake. there is often a great noise first. Then the earth 2 terribly; many houses fall down. Railway tracks break and trains go 3 lines; a great many factories are 4 ; thousands of deaths are caused, and many more lose homes... 5 the great damage and deaths caused by the earthquake itself, other disasters such as fires often 6 . More buildings are destroyed and more 7 are caused. It is well known of the 8 of a possible earthquake, and for centuries man has been making researches on earthquakes. More than 2,000 years ago, 9 , a Chinese scientist named Zhang Heng invented a machine which could find out from which 10 the seismic (地震的) waves had come, and this machine is still 11 by scientists today. Now we know much more about earthquakes and 12 they happen, but we still cannot tell exactly when and where an earthquake will happen, and cannot 13 it from happening. So earthquakes are among the 14 disasters in the world. No one can stop natural earthquakes. 15 , scientists can help stop earthquakes destroying whole cities and causing too many deaths. | ||||
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