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（请给出正确答案）
M: Yes. Andrew and I are both thinking about investigating the history of Africa during the time of the great Egyptian civilization. Maybe Andrew will focus on why it declined. I'm taking a different focus.
Q: What subject is the man speaker going to focus on？
(19)
A．He will focus on the history of Africa.
B．He will focus on the great Egyptian civilization.
C．He will focus on the class research project.
D．He will focus on some other aspects.
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缺失，余留牙情况良好，活动义齿可采用的设计形式为（）
缺失，余留牙情况良好，活动义齿可采用的设计形式为（）
缺失，余留牙情况良好。活动义齿可采用的设计形式是（）
