单项选择题

The author accuses 'the welfare officials of being _________ .

A．selfish
B．egoistic
C．self-important
D．self-conscious
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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
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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