Unlock l4 （第四级）：b2，对应 fce，对应 公立高中毕业时 水平； unlock l5 （第五级）：c1，对应 cae，对应 优秀高中毕业或大学生水平。 也就是说，这套书从孩子有一定英语基础开始，一直覆盖. As a small but national charity, we rely on charitable grants and individual donations to continue running theforum. By being independent, we are.
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