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According to the passage all these factors affect the maternal environment except
(A) smoking cigarettes
(B) stress hormones in the blood
(C) protein in the diet
(D) illicit activities
(E) exposure to pollutants
Ans : D
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Which of the following could lead to a significant increase in the population’s IQ?
(A) Interventions aimed at improving the prenatal environment
(B) A reduced rate of cigarettes smoked by the mother
(C) Less air pollution
(D) Better nutrition
(E) The mother’s mental make-up
Ans : A
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According to the Pittsburgh researchers
(A) nonidentical twins are more genetically alike than other siblings.
(B) other siblings are genetically similar to twins.
(C) nonidentical twins are as genetically unlike as other siblings.
(D) siblings are all genetically alike.
(E) fraternal and nonidentical twins are genetically alike.
Ans : C
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The word "dyad" in line 111 means
(A) a die-hard
(B) dyed-in-the -wool
(C) a pair
(D) a banality
(E) an aphorism
Ans : C
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