题目内容：
We're happy to report that business is booming this year.A．risky
B．successful
C．failing
D．open
参考答案：
答案解析：
单选题：We're happy to report that business is booming this year.
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A．risky
B．successful
C．failing
D．open
A．risky
B．successful
C．failing
D．open
下图中是一个由许多完全相同的白色立方体构成的实心塔，共有20层，除了与桌子接触的那一面，塔的外表都被涂成了红色。如果将塔
下图中是一个由许多完全相同的白色立方体构成的实心塔，共有20层，除了与桌子接触的那一面，塔的外表都被涂成了红色。如果将塔拆开，请问有多少个各面全都是白色的立方体
21101，9633，8624，7523，954，（ ）。
21101，9633，8624，7523，954，（ ）。
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请根据以下内容回答题：SemcoAt 21, Ricardo Semler became boss of his father's business in
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