单项选择题

The following advantages of smokeless tobacco are listed EXCEPT that _________ .

A．it is an effective substitute for ordinary smoking
B．it has no side effects
C．it avoids second-hand smoke
D．it can prevent a fire from bursting out
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单项选择题
The author accuses 'the welfare officials of being _________ .
A．selfish
B．egoistic
C．self-important
D．self-conscious
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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