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  3. Throughout the nation’s more than 15,000 school districts, widely differing approaches to teaching science and math have emerge

Throughout the nation’s more than 15,000 school districts, widely differing approaches to teaching science and math have emerge

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问题     Throughout the nation’s more than 15,000 school districts, widely
differing approaches to teaching science and math have emerged.
Though there can be strength in diversity, a new international analysis
suggests that this variability has instead contributed to lackluster
achievement scores by US children related to their peers in other【S1】________
developed countries.
    Indeed, concludes William H. Schmidt of Michigan State University,
who led the new analysis, " no single intellectual coherent vision【S2】________
dominates US educational practice in math or science. " The reason, he
said, "is because the system is deeply and fundamentally flawed. "
The new analysis, which released this week by the National Science【S3】________
Foundation in Arlington, Va. , is based on data collecting from about 50【S4】________
nations as part of the Third International Mathematics and Science Study.
    Not only approaches to teaching science and math vary among【S5】________
individual US communities, the report finds, but there appears to be a【S6】________
little strategic focus within a school district’s curricula, its textbooks, or
its teachers’ activities. This contrasts sharply with the coordinated
national programs of most other countries.
    In average, US students study more topics within science and math【S7】________
than their international counterparts do. This creates an educational
environment where "is a mile wide and an inch deep," Schmidt notes.【S8】________
    For instance, eighth graders in the US cover about 33 topics in
math versus just 19 in Japan. Among science courses, the international
gap is even wide. US curricula for this age level resemble those of a【S9】________
small group of countries including Australia, Thailand, Iceland, and
Bulgaria. Schmidt asks whether the US wants to be classed with these
nations, whose educational systems " share our pattern of splintered
visions" and which are not economic leaders.【S10】________
【S10】
选项
答案and—but
解析 连词误用。此处前后两句语义相反，应该用转折连词but。此处意为“那些国家对教育体系的构想和我们一样地支离破碎，但并不是经济的领导者”。
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