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．Experimental medicines.B．Special treatment centers.C．Flexible work schedule.D．Innovative physical exercise.
A．Experimental medicines.
B．Special treatment centers.
C．Flexible work schedule.
D．Innovative physical exercise.
单项选择题
A．He appreciates her concern.B．He is indifferent.C．He does not like it.D．He cannot understand it.
A．He appreciates her concern.
B．He is indifferent.
C．He does not like it.
D．He cannot understand it.
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