单选题：The authors of the Ambio study have found that ________.

题目分类：小学英语
题目类型：单选题
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题目内容：

The authors of the Ambio study have found that ________. A．forests get rid of lead pollution faster than expected
B．lead accumulations in forests are more difficult to deal with
C．lead deposits are widely distributed in the forests of the US
D．the upper layers of soil in forests are easily polluted by lead emissions

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答案解析：

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职业健康安全管理体系与环境管理体系文件中，（　　）对施工企业整个管理体系的整体性描述，为体系的进一步展开以及后续程序文件的制订提供了框架要求和原则规定。A．程序

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