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
What is one trend attributed to technological innovation in media communication
A．science fiction
B．historical fiction
C．realism
D．news development
单项选择题
Which of the following statements is NOT true according to the passage
A．Quite a big percentage of Americans are cigarette smokers.
B．Americans are well informed of the danger from smoking.
C．Smokers of cigarettes may die of cancer.
D．The campaign against smoking succeeds in preventing Americans from smoking.
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