20.（ ）

(单选题)The joke about doctors implies that, in the eyes of nurses, (单选题)To make your humor work, you should ______. (单选题)Which of the following about the boy is WRONG? (单选题)When the boy finally told his father that all the nails were (单选题)Underlined expression “dwindled down” means ______. (单选题)When the boy lost his temper, he must ______ as his father t (单选题)What is the author’s attitude towards the Vikings? (单选题)What is the main topic discussed in this passage? (单选题)All the following belong to the Viking’s achievement EXCEPT (单选题)Which of following statements is NOT true about the Icelande