论文正文表述的时态是唯一的，必须是一般现在时。
A. 对
B. 错
A unified paper is one that deals with a single subject and several ideas.
A. 对
B. 错
Unity aims to maintain the order and continuity only for the chapters or sections.
A. 对
B. 错
让论文衔接自然的方法有哪些？
A. transitional words and phrases
B. pronouns
C. repetition of key words and phrases
D. consistant point of view
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