单选题：Sulfur has occasionally been found in the earth in an almost

题目内容：

Sulfur has occasionally been found in the earth in an almost pure state. A．regularly
B．accidentally
C．sometimes
D．successfully

参考答案：

答案解析：

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分类：卫生类题型：单选题

分类：卫生类题型：单选题

分类：卫生类题型：单选题