1.锻炼口语:https://www.englishclub.com/
2.背诵4级6级单词:https://m.hujiang.com/en/p1408158/
3.阅读理解:http://www.xuexili.com/cet4/2803.html
4.建议:https://sjz.xhd.cn/info/nlts/905887.html
5.锻炼听力:https://polyglotclub.com/help/language-learning-tips/listening-comprehension/translate-mandarin-chinese