79.（ ）

(单选题)The text is mainly about ______ (单选题)What does Edmund think of expensive brands? (单选题)Who have the same opinion on expensive brands? (单选题)The example of Jim’s report wants to tell us ______. (单选题)What can we infer from the last paragraph? (单选题)Why do many plastics have different chemicals added to them? (单选题)What does the underlined word “It” in paragraph 3 refer to? (单选题)What is the first paragraph mainly about? (单选题)The passage is mainly about ______. (单选题)The Polar Bears like to swim year-round for ______