B

练习内容

[{"word":"back","pronun":"[b\u00e6k]","translation":"adv. \u56de\u539f\u5904; \u56de\u53bb adj. \u540e\u9762..."},{"word":"bad","pronun":"[b\u00e6d]","translation":"adj. \u574f\u7684; \u4e0d\u5065\u5e