New version of 4000 words, high-quality reading version! Select 4000 high-frequency words, with pictures and stories, from shallow to deep! There is not much difference between the new version and the old version in content; The differences between the first edition (old edition) and the second edition (new edition) are as follows: the second edition is updated by about 10%; Words, phrases and articles can be read by clicking, but not by clicking exercises, which are equipped with answers. 4000 is a set of practical English word series books. It is a classic textbook that can really expand vocabulary. Recommend American high school students to prepare for the SAT. On the basis of the textbook, this course expands vocabulary and grammar, as well as all-round training in correcting pronunciation and making sentences. Really improve "English power"! The answer is attached to the book, or you can find the answer on the software.