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(单选题)What did Adam Smith say about sugar, alcohol and tobacco? ( (单选题)According to the author, the primary solution to environment (单选题)According to the author, why fish resources are diminishing? (单选题)The huge increase in world population and production ( ). (单选题)According to the author, most students ( ). (单选题)Which of the following is true according to the last paragra (单选题)Which of the following would Peter Costa most probably agree (单选题)The phrase "swift reversal" most probably refers to ( ). (单选题)According to the first two paragraphs, the decline of high-s (单选题)It is indicated in the first paragraph that ( ).