People can buy tickets, change or refund tickets, easily and directly on the mobile phone. 答案: 正确

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People can buy tickets, change or refund tickets, easily and directly on the mobile phone. 答案: 正确

风从东方来：今日中国概况（全英文课程）(杭州师范大学) 中国大学mooc答案满分完整版章节测试 m337907

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