As we know, knowledge is the ______ condition for expansion of the mind.

(单选题)（ ） (单选题)Poetry tries to express . (单选题)According to the author, poetry . (单选题)The author suggests that . (单选题)The underlined sentence in Paragraph 1 means that . (单选题)What is the main idea of this passage? (单选题)What does the underlined word “this” refer to? (单选题)Which of the following statements is true? (单选题)Which of the following is not the advantage of edible plates (单选题)Which statement best demonstrates that California is a land