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A. She was just telling a joke about quitting her job.
B. She wasn't satisfied with her salary.
C. She was fed up with counting money at her job.
D. She was to quit her job and look for an accounting job.

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树洞填充可用以下材料__________。

A. 水泥砂浆
B. 沥青混合物
C. 聚氨酯塑料
D. 木块、软木

树种处理的主要步骤是，，整形，，涂漆和。

清理大树洞时，应全部清除变色木质部。

A. 对
B. 错

简述生物碱结构分类的依据。