有些家长，光是找老师组一对水平相当的口语搭子来指导口语专项，也要两千多。
而在我看来，剑桥测试体系，就是给我们三线城市的父母，提供了一个横向观察、比较教育发达城市娃英语水平的标准。
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知乎，让每一次点击都充满意义 —— 欢迎来到知乎，发现问题背后的世界。
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如果你觉得贵，那想一想口罩那几年，不少北京、上海的考生急于拿证，打飞的到澳门去考，那个成本。
欢迎关注@B计划老妈，孩子成长路漫漫，在这不可逆的十八年里，努力扶君上马，送君一程，但内心始终有B计划。
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最后，看的都是自家具体又合乎实际的规划。毕竟哪一条路，都要花钱、花时间。
剑桥的官方真题可不便宜，动不动五、六十，七、八十一本，整个几套，再加上点听力、口语、语法、阅读、写作的专项训练，四、五百块到小一千，就花出去了。
如第 six 章所述，光诱导的电子转移可以分为两种情况：电子供体的激发和电子受体的激发，表示为 D*+A → D+•+A−• → D+A+hν（D 将激发态电子转移到 A 的 LUMO，接着电子从 A 的 LUMO 回到 D 的基态轨道而发光）和 p e t D+A* —→ D+•+A−• → D+A+hν（A 被激发后，D 将 HOMO 电子转移到 A 的 HOMO 或空穴，接着处于 A 激发态电子跃迁至 D 的 HOMO 而发光）。
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（每个级别具体的备考时间投入，建议大伙儿去小花生上多找一下经验贴，在此不赘述了）。