题目内容：
Everybody was glad to see Mary back.
A．sorry B．sad
C．angry
D．happy
参考答案：
答案解析：
单选题：Everybody was glad to see Mary back.
- 题目分类：卫生类
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B．sad
C．angry
D．happy
B．sad
C．angry
D．happy
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通过对投资项目产量、成本和利润关系的分析，找出投资项目经济效益在某一范围内的临界值，这一分析过程就叫做（ ）。A．风险分析 B．敏感性分析 C．盈亏平衡分析
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