单选题：The 1906 earthquake in San Francisco is the most severe one

题目内容：

The 1906 earthquake in San Francisco is the most severe one in American history.
A. Right
B. Wrong
C. Not mentioned

参考答案：

答案解析：

We're happy to report that business is booming this year.

We're happy to report that business is booming this year.A．risky B．successful C．

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