甲状腺一侧切除术后发生窒息的可能原因为（）
A.出血压迫气管
B.喉返神经损伤
C.喉头水肿
D.气管塌陷
E.喉上神经损伤
参考答案：A, C
In 1492, Columbus_______ on one of the Bahama Islands, but he mistook it for an island of India.
A lands B landed C has landed D had landed
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