New research suggests the time is ready for a change:

　　Matched against 39 other developed countries, the United States is near the bottom in the rankings of average weekly instructional time in school.

　　Measured over 12 years, students in the top-scoring countries spend the equivalent of a full extra year in school.

　　US students perform poorly on math and science tests compared to their international peers, according to a US Education Department comparison released earlier this month. In math, American 15-year-old scored near the bottom among the study's 30 developed countries.

　　Most countries that boost the number of minutes spent on math instruction find pay offs in improved math scores, according to a study released this month by the Brookings Institution. Small increases in the school day are more effective than a longer school year, the report concluded.

　　The most encouraging news about the benefits of extending the school day comes from Massachusetts, where an experiment with 10 schools, including Kuss, appears to be working. Those 10 schools lengthened their instructional days by 25% and boosted their state scores in math, English and science at all grades.

　　Perhaps the concept won't work everywhere. Certainly, it won't instantly be popular. But it's obvious that a problem exists or that adding class time seems to help.

　　67. What is the main idea of the above passage?

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