单项选择题

A．From his aunt.
B．From Barbara.
C．From charity organizations.
D．Investment returns.
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单项选择题
A．How to develop a new airplane technology.B．Features and possible usages of a special engine.C．How to do experiment with dangerous engines.D．How to do experiment with unmanned airplanes.
A．How to develop a new airplane technology.
B．Features and possible usages of a special engine.
C．How to do experiment with dangerous engines.
D．How to do experiment with unmanned airplanes.
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A．How to communicate effectively.B．Why successful communication are important.C．What communication is.D．How to avoid direct communication.
A．How to communicate effectively.
B．Why successful communication are important.
C．What communication is.
D．How to avoid direct communication.
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