7. Throughout the 1950’s, there were increases in the numbers of dead birds fou

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试卷: TS Critical Thinking 20 题 No2


[单选题]

7. Throughout the 1950’s, there were increases in the numbers of dead birds found in agricultural areas after pesticide sprayings. Pesticide manufacturers claimed that the publicity given to bird deaths stimulated volunteers to look for dead birds, and that the increase in numbers reported was attributable to the increase in the number of people looking.
Which of the following statements, if true, would help to refute the claim of the pesticide manufacturers?

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