正常成人食管下口（即贲门）与气管最下约距多少个胸椎距离（）。
A.9
B.8
C.6
D.4
E.2
参考答案：C
用所给词的正确形式填空。
1. Let's (put) the letter in the envelope.
2. They are (fly) kites in the park.
3. Danny is (write) a letter for his friends.
4. She (want) to go shopping.
5. They (have) fun yesterday.
早期症状轻，常只有局限性腹膜炎（）。
A．外伤性胆道出血
B．胃破裂
C．肝破裂
D．十二指肠损伤断裂
E．乙状结肠破裂
