Unit One

Unit Two

Unit Three

Unit Four

Unit Five

Unit Six

Unit Seven

Unit Eight

Unit Nine

Unit Ten

Unit Eleven

Unit Twelve

Unit Thirteen　

Unit Fourteen

Unit Fifteen

Unit Sixteen

Unit Seventeen

Unit Eighteen

Unit Nineteen

Unit Twenty

附录A 四级高频词汇速记表

附录B 四级真题词汇句句秀索引