What is said about the average American in the passage、

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• 1It can be inferred from the last paragraph that scientists ________.

  A.are puzzled by the mystery of forest pollution

  B.feel relieved by the use of unleaded gasoline

  C.still consider lead pollution a problem

  D.lack sufficient means to combat lead pollution

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• 2The 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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• 3How did scientists discover the source of lead pollution in Greenland、

  A.By analyzing the data published in journals like Nature and Ambio.

  B.By observing the lead accumulations in different parts of the arctic area.

  C.By studying the chemical elements of soil and snow in Northeastern America.

  D.By comparing the chemical compositions of leaded gasoline used in various countries.

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• 4Lead accumulation worldwide decreased significantly after the use of unleaded gas in the US ________.

  A.was discouraged

  B.was enforced by law

  C.was prohibited by law

  D.was introduced

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• 5The study published in the journal Nature indicates that ________.

  A.the Clean Air Act has not produced the desired results

  B.lead deposits in arctic snow are on the increase

  C.lead will stay in soil and snow longer than expected

  D.the US is the major source of lead pollution in arctic snow

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• 6Some people dislike exercise because ________.

  A.they think it is physically exhausting

  B.they find it hard to exercise while on a diet

  C.they don’t think it possible to walk 3 miles every day

  D.they find consulting caloric-expenditure charts troublesome

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• 7“Even exercise professionals concede half a point here” (Line 3, Par

  A.2) means “They ________”.A.agree that the calories in a small piece of pastry can be difficult to work off by exercise

  B.partially believe diet plays a supporting role in weight reduction

  C.are not fully convinced that dieting can help maintain one’s new weight

  D.are not sufficiently informed of the positive role of exercise in losing weight

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• 8What was confirmed by the Boston University Medical Center’s study、

  A.Controlling one’s calorie intake is more important than doing exercise.

  B.Even occasional exercise can help reduce weight.

  C.Weight reduction is impossible without exercise.

  D.One could lose ten pounds in a year’s time if there’s no increase in food intak

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• 9What is the author’s purpose in writing this article、

  A.To justify the study of the Boston University Medical Center.

  B.To stress the importance of maintaining proper weight.

  C.To support the statement made by York Onnen.

  D.To show the most effective way to lose weight.

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• 10The machine looked like a large, ________, old-fashioned typewriter.

  A.forceful

  B.clumsy

  C.intense

  D.tricky

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