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It is well known that teenage boys tend to do better (1 )math than girls, that male high school students are more likely than their female counterparts ( 2 )advanced math courses like calculus, that virtually all the great mathematicians ( 3 ) men. Are women born with(4)mathematical ability? Or does society’s sexism slow their progress? In 1980, two Johns Hopkins University researchers tried ( 5 )the eternal nature/nurture debate. Julian Stanley and Camilla Benbow ( 6 )10,000 talented seventh and eighth graders between 1972 and 1979. Using the Scholastic Aptitude Test, in which math questions are meant to measure ability rather than knowledge, they discovered ( 7 )sex differences.(8 ) the verbal abilities of the males and females ( 9 )differed, twice as many boys as girls scored over 500 (on a scale of 200 to 800) on mathematical ability; at the 700 level, the ratio was 14 to 1. The conclusion: males have (10 )superior mathematical reasoning ability.

Benbow and Stanley’s findings,(11)were published in “Science”，disturbed some men and(12)women. Now there is comfort for those people in a new study from the University of Chicago that suggests math (13 )not, after all, a natural male domain. Prof. Zalman Usiskin studied 1,366 tenth graders. They were selected from geometry classes and tested on their ability to solve geometry proofs, a subject requiring( 14)— abstract reasoning and spatial ability. The conclusion(15)by Usiskin: there are no sex differences in math ability.

1.A、 at                      B、 top              C、 of                   D、 about

2.A、 in tackling        B、 tackling       C、 to tackle         D、 about tackling

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