单项选择题

What is indicated as a possible future development in television

A．wall-size projection
B．mini-projection
C．color projection
D．true-size projection
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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
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
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