外科急腹症中发病率最高的疾病为：
A．腹膜炎
B．胰腺炎
C．胆囊炎
D．阑尾炎
E．肠梗阻
参考答案：D
I couldn't go to sleep last night because I heard loud _____ outside all the time.
A. noises
B. voices
C. sounds
D. smells
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