Which of the following statements about the 1970 Birth Cohert Survey is CORRECT？A．Each sub

Which of the following statements about the 1970 Birth Cohert Survey is CORRECT？

A．Each subject received four educational development tests.

B．The survey was designed to prove the decisive role of genes.

C．The finding of the survey is against Woodhead"s viewpoint.

D．The survey turns out to be useless in the field of medicine.

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