单项选择题

A．The speed of light.
B．The speed of telecommunications.
C．Astronauts landing on the moon.
D．The United States.
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单项选择题
A．buildingsB．placesC．librariesD．organizations
A．buildings
B．places
C．libraries
D．organizations
单项选择题
A．transferredB．transmittedC．transittedD．translated
A．transferred
B．transmitted
C．transitted
D．translated
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