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Right Wrong Not mentioned
publishes has been published is published published
was discouraged was enforced by law was prohibited by law was introduced
interrupt contradict predict overcome
on account of by means of in case of in spite of
after two weeks. after one week. after 10 weeks. after 18 weeks.
By analyzing the data published in journals like Nature and Ambio. By observing the lead accumulations in different parts of the arctic area. By studying the chemical elements of soil and snow in Northeastern America. By comparing the chemical compositions of leaded gasoline used in various countries.
forests get rid of lead pollution faster than expected lead accumulations in forests are more difficult to deal with lead deposits are widely distributed in the forests of the US the upper layers of soil in forests are easily polluted by lead emissions
publishing published publish to publish
are puzzled by the mystery of forest pollution feel relieved by the use of unleaded gasoline still consider lead pollution a problem lack sufficient means to combat lead pollution
A. respect respecting being respected respected
the Clean Air Act has not produced the desired results lead deposits in arctic snow are on the increase lead will stay in soil and snow longer than expected the US is the major source of lead pollution in arctic snow
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