加州开发了iPad代数应用的霍顿·米夫林-哈考特宣称，其计划比较使用数字化教科书与传统课本的考试成绩。
Houghton Mifflin Harcourt, which developed the iPad algebra program in California, said it planned to compare the test scores of students using a textbook in digital and traditional book formats.
加州开发了iPad代数应用的霍顿·米夫林-哈考特宣称，其计划比较使用数字化教科书与传统课本的考试成绩。
Houghton Mifflin Harcourt, which developed the iPad algebra program in California, said it planned to compare the test scores of students using a textbook in digital and traditional book formats.
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