有关癌症三级止痛阶梯疗法说法正确的是（）
A.为了节约药品资源，分阶段逐步应用轻度、中度和重度疼痛止痛药的方法
B.为了提高癌症病人的生存质量，根据癌症病人的需要，分级选用轻度、中度和重度疼痛止痛药的方法
C.为了提高癌症病人的生存质量，根据癌症病人的性质，采取由弱到强逐级增加使用相应镇痛药的方法
D.为了提高癌症病人的生存质量，根据癌症病人的疼痛程度和原因，适当选择相应镇痛药的方法
E.为了提高癌症病人的生存质量，根据癌症病人的性质和病人的疼痛程度，采取由强到弱逐级递减使用相应镇痛药的方法
参考答案：D
Arnold Pointer, a professional fisherman from the south of Australia, set free (释放) a big female white shark that was 1 in his large fishing nets. He thought she would have more and more babies. But now the fisherman is facing a(n) 2 problem. The white shark is so 3 to him that for nearly 2 years she hasn’t left him 4 . She even follows him everywhere. 5 this, Arnold Pointer can’t do fishing — all the fishes are scared at her, and he doesn’t know 6 to do anymore. It is hard to drive away such an almost 17-feet-long shark for Arnold Pointer. We all know the white sharks are protected 7 the wildlife conservation. At the same time, some special feeling has been 8 between Arnold and “Cindy”, the name the fisherman has given the white shark. Arnold says, “Every time I stop the boat, she always comes to me, turns on her back and lets me pet (抚摸) her body and neck. She sings, turns her eyes, and moves her fins (鳍) up and down, hits the water 9 .” Cindy is 10 an interesting animal that Arnold has to try to go fishing in different places. Doesn’t Cindy know what her action means? Maybe she really doesn’t understand.
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