单项选择题
A．valuableB．pointlessC．uselessD．irrationalThe author se……
The author seems to consider it to be ______ for those Swedish smokers to switch to smokeless tobacco.
A．valuable
B．pointless
C．useless
D．irrational
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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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