单项选择题

According to the passage, alcohol has something to do with bad breath mainly because ______.

A．it keeps offending bacteria from reproducing
B．its smell adds to bad breath
C．it kills some helpful
D．it affects the normal flow of saliva
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单项选择题
The underlined word dubious (Line 2, Para. 2) most probably means ______.
A．valuable
B．useful
C．doubtful
D．helpful
单项选择题
From the passage it can be seen that employeeship helps one ______.
A．to be more successful in his career
B．to be more specialized in his field
C．to solve technical problems
D．to develop his professional skill
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