皮皮学，免费搜题
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【单选题】
外毒素的化学性质是A.
脂类
B.
多糖
C.
蛋白质
D.
氨基酸
E.
脂多糖
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反馈参考答案：
举一反三
【单选题】________, she stood and stared while the police arrested her husband.
A.
Amazing
B.
Being amazed
C.
Amazed
D.
Amazement
【单选题】The ________ expression on her face suggested she was _______ when she heard the news.
A.
amazed; amazed
B.
amazed; amazing
C.
amazing; amazed
D.
amazing; amazing
【简答题】举例说明什么是机会成本。区分机会成本与会计成本的意义何在？
【简答题】举例说明什么是机会成本?
【简答题】举例说明什么是机会成本，什么是会计成本，二者的区别与联系是什么。
【简答题】什么是机会成本?举例说明
【单选题】The look on her face suggested that she _____ it before _____. [ ]
A.
amazing, wouldn't know
B.
amazed, hadn't known
C.
amazing , hadn't known
D.
amazed, shouldn't know
参考解析：
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