In the case of Oscar and Jack, heredity seems to determine physical and mental abilities, tastes, and behavior. Environment seems to determine thought.

　　21. After their parents divorce, Oscar and Jack ______.

　　A. went to live with their mothers family

　　B. were brought up by their father

　　C. never saw each other again

　　D. were separated until 1954

　　22. Although Oscar and Jack are similar in many ways, they seem to be different in

　　A. physical ability B. behavior

　　C. mental ability D. thought

　　23. Identical twins are more similar than fraternal twins because A. they have the same mother

　　B. they have the same genetic characteristics

　　C. they were brought up together

　　D. they were born at the same time

　　24. The conclusion of Newman, Freeman and Halzingers 1937 twin study was that

　　A. size is determined by height, weight, and environment

　　B. identical twins are taller and heavier than fraternal twins

　　C. size is determined more by heredity than by environment

　　D. identical twins are more similar than fraternal twins

　　25. Shield drew a slightly different conclusion from his study because_______.

　　A. he also compared the intelligence of the twins in his study

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