食管癌（）。
A.未见明显X线改变
B.食管狭窄与正常食管段过渡、边缘整齐、无钡影残缺征
C.食管中下段可见虫蚀样或蚯蚓样充盈缺损
D.管腔不规则狭窄、充盈缺损、管壁蠕动消失、黏膜紊乱
E.食管下端呈鸟嘴样改变，黏膜纹尚正常
参考答案：D
解析：2.吗啡中毒时，呼吸中枢抑制，出现呼吸缓慢。3.严重的房室传导阻滞导致心室率缓慢，无法满足脑供血，可出现抽搐或意识障碍。
| 情景对话。 | |
| Kitty: Hello! May I speak to Simon, please? Simon: Hello. 1______ Is that Kitty? Kitty: Right. Would you like to go to the Palace Museum tomorrow? Simon: 2______ Kitty: We can see many works of art there. Simon: 3______ Kitty: Two exchange students from Thailand. Simon: That sounds great. 4______ Kitty: We'll meet outside the supermarket near your home at 6:30 a.m. Simon: OK. 5______
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