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单项选择题

某二叉树的前序遍历序列与中序遍历序列相同，均为ABCDEF，则按层次输出(同一层从左到右)的序列为A.ABCDEFB.BCDEFAC.FEDCBAD.DEFABC

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The sentence "Tom was cutting a piece of metal with great care" is a periodic sentence.
A、正确
B、错误
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In illustration essays, what kind of examples can writers use?  （   ） A.  General    B. Specific  C. Representative   D. Relevant
单项选择题
The accuracy and variety of pronunciation include ________.
A、stress
B、intonation
C、chunking
D、above all
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