问题详情

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Human intelligence and the IQ scales used to measure it once again are becoming the focus of fiery debate.
As argument rages over declining test scores in the nation"s schools ,an old but explosive issue is reappearing ;What is intelligence - and is it determined largely by genetics？
The controversy erupted more than a decade ago when some U. S. scholars saw a racial pattern
in the differing scores of students taking intelligence and college-entrance tests.
Now ,the racial issue is being joined by others. Teachers ,psychologists, scientists and lawyers argue over the question of whether IQ一 intelligence quotient - tests actually measure mental abili-ty ,or if findings are skewed by such factors as family background ,poverty and emotional disorders.
Moreover ,some authorities assert that the rise in the number of college-educated Americans and their tendency to marry among themselves are creating a class of supersmart children of brainy parents – and ,on the other side of the scale ,a lumpenproletariat of children reflecting the suppos-edly inferior brainpower of their parents.
Critics such as Harvard University biologist Richard C. Lewontin disagree. If mental ability were largely determined by inheritance,he says,efforts to enhance intelligence through the better-ment of both home and child-rearing environments could only be marginally effective. He com- ments :
" Genetic determinism could be used to justify existing social injustice as predetermined and in-evitable and would render efforts made toward equalitarian goals as useless. "
Supporting Lewontin in this is J. McVicker Hunt,a professor at the University of Illinois,who maintains that IQ levels can be raised significantly by exposing children at an early age to stimula- ting environments. Hunt"s studies show that early help in such areas as education and nutrition can raise a child"s IQ by an average of 30 t0 35 points.
At stake in the uproar over IQ is the national commitment to improve the capabilities of the poor by investing billions of dollars annually in educational ,medical and job programs.
51. The controversy over IQ tests is reappearing because of
[ A] the newly found racial pattern underlying students" performance.
[B] the worsening students" performance in their studies.
[ C] the long-standing division in the definition of intelligence.
[ D] the dubious IQ scales used to measure intelligence.请帮忙给出正确答案和分析，谢谢！