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How much can environment affect intelligence? In one study, striking increases in IQ occurred in 25 children who were moved from an orphanage(孤兒院) to more stimulating（使人興奮的，使人振奮的） environments．The children, who were all considered mentally retarded and unadoptable, were moved to an institution where they received personal attention from adults．Later, these supposedly retarded children were adopted by parents who gave them love, a family ,and a stimulating home environment．The children gained an average of 29 IQ points．For one child, the increase was an amazing 58 points．A second group of initially less "retarded" children, who stayed in the orphanage, lost an average of 26 IQ points.
Other encouraging results can be found in early childhood education programs, which provide stimulating intellectual experiences for disadvantaged children．In one study, children from low-income families were given enriched environments from early infancy(嬰兒期) through preschool．By age 2 their IQ scores were already higher than those in a control group．More important, they were still 5 points higher seven years later．High-quality enrichment programs such as Head Start can prevent children from falling behind in school.
A particularly striking environmental effect is the fact that 14 nations have shown average IQ gains of from 5 to 25 points during the last 30 years．These IQ boosts, averaging 15 points, occurred in far too short a time for genetics to explain them．It is more likely that the gains reflect environmental forces, such as improved education, nutrition, and living in a technologically complex society.
小題1:What's the main idea of this passage
A．Retarded children cannot improve their IQ's.
B．Orphanages are full of mentally retarded children.
C．Environmental factors influence a child's IQ.
D．Early childhood education programs are important.
小題2:The author is in favor of _____________ according to the passage.
A．putting retarded children into institutions
B．providing early childhood education programs
C．keeping children in orphanages
D．keeping retarded children with others like themselves
小題3:Which of the following is NOT mentioned as an environmental factor that affects IQ       .
A．Good nutrition．B．Improved technology.
C．Better education．D．Food pollution.
小題4:What can we conclude from the passage ?
A．Attention from parents has little effect on a child's IQ.
B．Head Start programs are a waste of money.
C．Increases in IQ have happened in the US more rapidly than elsewhere.
D．Genetics are less important than environment in gaining one's IQ.

小題1:C
小題2:B
小題3:D
小題4:D
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