After a short ______, someone suddenly made a loud noise.

(单选题)How was the research conducted? (单选题)What should be the best title for the text? (单选题)According to Drkyriazis, which of the following may be “good (单选题)What does the underlined word “it” in Paragraph 3 refer to? (单选题)What is Dr Kyriazis’ opinion probably based on? (单选题)Which of the following can first be chosen as a volunteer? (单选题)The volunteers’ primary responsibility is to help people wit (单选题)What does the underlined part mean? (单选题)The text is meant to ______. (单选题)30.（ ）