简答题Which of the following statements is false? A、 We should better use affirmative structures. B、 We should avoid contractions and colloquial words. C、 We should better use impersonal constructions. D、 We should avoid the first person pronoun I and the second person pronoun you.简答题What kinds of contents are expected in an introduction in academic writing? A、 Establish the importance of your field B、 Provide research background C、 Locate a gap in the research D、 Describe the present paper