If you want to improve your spoken English, you’d better ______.

(单选题)The underlined part in paragraph 2 means ______. (单选题)The best title for the passage might be ______. (单选题)What does paragraph 1 want to tell us about Steven Callahan? (单选题)What was the mood of the researchers to discover this phenom (单选题)Which of the following is not the conclusion of the research (单选题)Why are there twice as many women as men with arthritis? (单选题)Which of the following is true? (单选题)Which of the following does not increase the risk of arthrit (单选题)40.（ ） (单选题)39.（ ）