颞下颌关节内强直的常见病因是
A．类风湿性关节炎和颞下颌关节紊乱病
B．坏疽性口炎和鼻咽部肿瘤放疗
C．喙突肥大和化脓性关节炎
D．腮腺炎和咬肌间隙感染
E．化脓性中耳炎和外伤
参考答案：E
解析： 颞下颌关节内强直的常见病因是化脓性炎症，以化脓性中耳炎最常见；另一个常见原因是创伤导致的关节损伤，多数在儿童期由于下颌骨损伤，尤其是髁部的对冲性损伤造成。故答案为E。
| 选择适当的句子补全对话。 | |
| A: Hi, Kate! 1. B: Oh, I've been to many places, such as Xi'an, Hangzhou, Shanghai, Guilin and Tibet. A: 2. B: Really? What places have you been to? A: Very few. I've only been to Pingyao. B: 3. A: It's in Shanxi. It's a small place, but it has a long history. It's one of the oldest towns in China. There you can see a well-kept city wall. B: 4. I've just seen a lot of natural beauties, but not much ancient Chinese culture (文化) yet. A: 5.
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