单选题：Paragraph 2 is mainly about______

题目内容：

Paragraph 2 is mainly about______ A．what makes us happy.
B．how to understand happiness.
C．how we can be happier.
D．what happiness can bring us.

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答案解析：

账套主管负责所选账套的维护工作。主要包括对所选账套进行修改、对年度账进行管理，以及该账套操作员权限的设置等。（　　）

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