試題詳解

31.
(A) There are definitely two sides to this issue.
(B) Scores decreased as the family size increased and also with birth order.
(C) An intelligence test was administered to over 350,000 Dutch males when they turned 19 years of age.
(D) On the other side are Rutherford and Sewell, who studied more than 10,000 American high school graduates.
(E) Since then, the theory has been elaborated and even extended to explain the positive effect of birth order on intelligence.