21. This selection can best be titled ______.
A. Measuring Your Intelligence
B. Intelligence and Environment
C. The Case of Peter and Mark
D. How the Brain Influences Intelligence
22. The best statement of the main idea of this passage is that ______.
A. human brains differ considerably
B. the brain a person is born with is important in determining his intelligence
C. environment is crucial in determining a persons intelligence
D. persons having identical brains will have roughly the same intelligence
23. According to the passage, the average I. Q. is ______.
A. 85 .
B. 100
C. 110
D. 125
24. The case history of the twins appears to support the conclusion that ______.
A. individuals with identical brains seldom test at the same level
B. an individuals intelligence is determined only by his environment
C. lack of opportunity blocks the growth of intelligence
D. changes of environment produce changes in the structure of the brain
25. This passage suggests that an individuals I. Q. ______.
A. can be predicted at birth
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