正确答案: A

胃穿孔

题目：腹部叩诊鼓音区扩大见于( )

解析：A

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举一反三的答案和解析：

[单选题]不属于副交感核的脑神经核是( )

孤束核

[单选题]According to this passage, which of the following is true?

The Negroes also belonged to the earliest immigrants to the North America.

解析：参见最后一段。