练习过程中的成绩时而下降、时而提高，这是练习的（ ）现象

(单选题)What does the author say about automation in Paragraph 2? (单选题)What can we know about AI from Paragraph 1? (单选题)What is the author’s purpose in writing the text? (单选题)The underlined phrase “a silver bullet” probably means that (单选题)In the eyes of Ainsworth, his company’s technology ______. (单选题)What is the biggest advantage of kite power? (单选题)What contributes most to Dylan’s career? (单选题)What does the underlined word “incorporate” in Paragraph 3 p (单选题)Which of Dylan’s works expanded the area of popular music? (单选题)Why was Bob Dylan awarded the Nobel Prize?