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.
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单项选择题
A．Two.B．Four.C．Six.D．Five.
A．Two.
B．Four.
C．Six.
D．Five.
填空题
The short-term potential success lies in Chinese medicine, herbs, and specialty food, as well as goods featuring ______.
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