2005年01月英语四级B卷试题（阅读4）

29. 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

30. It can be inferred from the last paragraph that scientists

A) lack sufficient means to combat lead pollution
B) still consider lead pollution a problem

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