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【简答题】
设有二如图所示。节点C的度为________,层次为________,树的度为________,树的高度(深度)为________,其前序遍历序列为________,中序遍历序列为________,后序遍历序列为________。
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举一反三
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【单选题】There is a blackboard _______ the classroom and another one _______ the classroom.of [     ]
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B.
in the front of, at back of
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in front of, at the back of
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in front of, at back
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【单选题】When the teacher came into the classroom, she was not ________ because the classroom was not as ________  as  ________. [     ]
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pleased; clean; usually
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angry; cleaning; usual
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pleased; clean; usual
D.
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【单选题】There isn’t a teacher in the classroom and all the students are talking. So the classroom is        ________.
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