Zegoni effect: refers to the phenomenon of better memory effect on unfinished work than on completed work. Founded by German psychologist Zegoni in a memory experiment in 1927. Which of the following is the Zegony effect? ['The wife got up to make the composer husband who loves to sleep, and kept popping the first three chords of a set of phrases on the piano. After listening, the composer turned around and finally had to get up and finish the last chord.', 'Learn from the past.', 'As long as it is something that he can identify, no matter how difficult it is, Xiao Li perseveres in his efforts to complete it and never quits halfway.', 'When Li reads a book, he always tries to stop and think about whether he is wasting time and energy. If so, he will make a choice based on whether to continue reading.']