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

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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 deposits are widely distributed in the forests of the US
C．lead accumulations in forests are more difficult to deal with
D．the upper layers of soil in forests are easily polluted by lead emissions

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