This book is specially developed for CET-4 candidates and is especially suitable for CET-4 candidates who need to break through vocabulary difficulties in the short term. The whole book is sorted out and 2,000 core words are included in this book, and these words are planned into a 20-day study plan. Each day's learning content includes 100 vocabulary words, and each entry includes its frequently tested definitions, collocations, real test examples and question source examples. This book sets up a Previous Check column at the beginning of each day for candidates to self-test before memorizing words, and to screen out known and unknown vocabulary so that they can allocate review time reasonably without having to memorize everything by rote.