患者男性，20岁，因“左下后牙遇冷、热刺激疼痛加重3天”来诊。患者右下后牙食物嵌塞4个月，进食冷、热、酸、甜食物时偶有不适，对冷、热刺激疼痛敏感加重，刺激消除疼痛即刻消退，不伴有自发性疼痛。既往患侧未经过任何治疗。口腔检查：左下6远中邻面龋损，龋洞内有大量食物嵌塞，腐质较多，探诊敏感，无穿髓孔，无叩痛，牙齿不松动，远中牙龈 * * 轻度充血，无明显触痛，患牙冷测试极敏感，疼痛呈一过性，牙髓活力电测试较对侧同名牙敏感。
临床诊断是（）
A.中龋
B.深龋
C.慢性牙髓炎
D.牙龈 * * 炎
E.急性牙周脓肿
F.侵袭性牙周炎
参考答案：B
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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