单项选择题

What invention incorporated the principles of light and radio radiation

A．satellite communication
B．X-ray
C．the laser beam
D．continuous wave
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单项选择题
Which of the following seems to be NOT true of smokeless tobacco
A．lethal
B．addictive
C．safe
D．non-combustible
单项选择题
What is one trend attributed to technological innovation in media communication
A．science fiction
B．historical fiction
C．realism
D．news development
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